What is Guitar: Definition and 153 Discussions

The guitar is a fretted musical instrument that typically has six strings. It is held flat against the player's body and played by strumming or plucking the strings with the dominant hand, while simultaneously pressing the strings against frets with the fingers of the opposite hand. A plectrum or individual finger picks may be used to strike the strings. The sound of the guitar is projected either acoustically, by means of a resonant chamber on the instrument, or amplified by an electronic pickup and an amplifier.
The guitar is classified as a chordophone – meaning the sound is produced by a vibrating string stretched between two fixed points. Historically, a guitar was constructed from wood with its strings made of catgut. Steel guitar strings were introduced near the end of the nineteenth century in the United States; nylon strings came in the 1940s. The guitar's ancestors include the gittern, the vihuela, the four-course Renaissance guitar, and the five-course baroque guitar, all of which contributed to the development of the modern six-string instrument.
There are three main types of modern guitar: the classical guitar (Spanish guitar/nylon-string guitar); the steel-string acoustic guitar; and the Hawaiian guitar (played across the player's lap). Traditional acoustic guitars include the flat top guitar (typically with a large sound hole) or an archtop guitar, which is sometimes called a "jazz guitar". The tone of an acoustic guitar is produced by the strings' vibration, amplified by the hollow body of the guitar, which acts as a resonating chamber. The classical Spanish guitar is often played as a solo instrument using a comprehensive fingerstyle technique where each string is plucked individually by the player's fingers, as opposed to being strummed. The term "finger-picking" can also refer to a specific tradition of folk, blues, bluegrass, and country guitar playing in the United States.
Electric guitars, first patented in 1937, use a pickup and amplifier that made the instrument loud enough to be heard, but also enabled manufacturing guitars with a solid block of wood needing no resonant chamber. A wide array of electronic effects units became possible including reverb and distortion (or "overdrive"). Solid-body guitars began to dominate the guitar market during the 1960s and 1970s; they are less prone to unwanted acoustic feedback. As with acoustic guitars, there are a number of types of electric guitars, including hollowbody guitars, archtop guitars (used in jazz guitar, blues and rockabilly) and solid-body guitars, which are widely used in rock music.
The loud, amplified sound and sonic power of the electric guitar played through a guitar amp has played a key role in the development of blues and rock music, both as an accompaniment instrument (playing riffs and chords) and performing guitar solos, and in many rock subgenres, notably heavy metal music and punk rock. The electric guitar has had a major influence on popular culture. The guitar is used in a wide variety of musical genres worldwide. It is recognized as a primary instrument in genres such as blues, bluegrass, country, flamenco, folk, jazz, jota, mariachi, metal, punk, reggae, rock, soul, and pop.

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  1. S

    What are the nodal points on a guitar string when plucked?

    Hello guys, I just have few questions about this. [PLAIN]http://www.acousticguitarelectricguitarlessons.com/images/guitar/Electric-Guitar-Parts.jpg Now I understand how a standing wave is formed. However I'm unsure what the nodal points are if I pluck an open string. Is it the...
  2. M

    Wave speed of a transversing guitar string?

    Hi, I'm completely stuck on a homework question and I really don't even know where to start... A guitar string is vibrating in its fundamental mode, with nodes at each end. The length of the segment of the string that is free to vibrate is 0.382 m. The maximum transverse acceleration of a...
  3. T

    Solving for Wave Speed: A Guitar String's Story

    Homework Statement A guitar string is vibrating in its fundamental mode, with nodes at each end. The length of the segment of the string that is free to vibrate is "L" . The maximum transverse acceleration of a point at the middle of the segment is "a" and the maximum transverse velocity is...
  4. B

    Connect electric guitar pickup to PC

    Hello, I would like to connect my guitar pickup directly to my PC, is it possible? I've wired an electric guitar pickup to a cable, which plugs directly to my sound card (where a microphone ought to be plugged): Sound Card -> Cable -> Electric Guitar Pickup. But it does not work...
  5. S

    Standing Waves on a Guitar String

    Homework Statement Learning Goal: To understand standing waves, including calculation of and , and to learn the physical meaning behind some musical terms. The columns in the figure (Intro 1 figure) show the instantaneous shape of a vibrating guitar string drawn every 1 . The guitar...
  6. S

    Calculating Frequency Changes in a Guitar String

    A guitar string 60 cm in length, with a diameter of 1.4 mm and a tension of 289 N, emits a note with a frequence of 147 Hz. Find the frequency in each of the followig situations: a)the tension isreduced to 196N b)a string of the same material, 45 cm long and 1mm in diameter under 168 N of...
  7. A

    Is Adding a Rotary Switch for Tone Control on an Electric Guitar a Good Idea?

    Hi Guys I have been asked to consider modifying a brand-new kit-form electric guitar. The owner envisages an extra rotary switch providing a selection of capacitors providing tone control options. My instinct is that this modification may be detrimental to the noise floor of the instrument...
  8. R

    Les Paul, Inventor of Electric Guitar, Passes Away

    Lester William Polfuss, the inventer of the solid body electric guitar, died today. http://www.telegraph.co.uk/news/obituaries/culture-obituaries/music-obituaries/6024055/Les-Paul.html" http://img3.musiciansfriend.com/dbase/pics/products/regular/6/9/8/393698.jpg
  9. D

    Build a Guitar Tuner Circuit for Improved Engineering Skills

    I'm trying to improve on my engineer skill so I'm building a guitar tuner circuit. I'm trying to build this circuit http://www.vuitservices.com/elec/Figure_01.gif This circuit is from http://electronicdesign.com/Articles/ArticleID/6264/6264.html . So far I have done this much. I used a...
  10. C

    Building a Guitar Effects Pedal

    Hello all! I am building an effects pedal for my guitar (dont have a choice, I spent all the money I was saving on the guitar). Since electronic components are cheap, for once, I am glad I am studying EE. At first I thought I'd design the circuits myself, but after doing a bit of research, I...
  11. R

    Fundamental frequency of a guitar string

    1. The problem is: A guitar string is 78 cm long and has a mass of 3.6 g. The distance from the bridge to the support post is L = 60 cm, and the string is under a tension of 505 N. What is the frequency of the fundamental? I don't get why it gives me two distances. Which one is L? 2. The...
  12. A

    Guitar String Pulse: Time & Reflection Calculation

    Homework Statement The wave speed in a guitar string is 265 m/s. The length of the string is 63 cm. You pluck the center of the string by pulling it up and letting go. Pulses move in both directions and are reflected off the ends of the string. a) How long does it take for the pulse to...
  13. A

    Dice, brassknuckles, and guitar

    Well, dice anyway... You make a sequence of rolls with a pair of dice. What is the probability that all six place numbers, 4-5-6-8-9-10, come up in any order before you roll a 7? In his book New Complete Guide to Gambling, John Scarne gave the calculation P =...
  14. A

    Calculating Length, Radius & Frequency of Steel Guitar String

    Homework Statement A string or rope will break apart if it is placed under too much tensile stress. Thicker ropes can withstand more tension without breaking because the thicker the rope, the greater the cross-sectional area and the smaller the stress. One type of steel has density 7890 kg/m^3...
  15. I

    Emf max for a guitar string.

    Homework Statement Review problem. A flexible metallic wire with linear density 3.00 multiplied by 10-3 kg/m is stretched between two fixed clamps 64.0 cm apart and held under tension 301 N. A magnet is placed near the wire as shown in Figure P31.25. Assume that the magnet produces a uniform...
  16. J

    How Much Does a Guitar String Stretch Under Tension?

    Homework Statement A 76 cm long, 1.0 mm diameter steel guitar string must be tightened to a tension of 2200 N by turning the tuning screws. By how much is the string stretched? Homework Equations F=kx K=YA/L The Attempt at a Solution I don't know how to approach this problem...
  17. G

    Who Plays Guitar? Exploring the Love and Influence of Musical Instruments

    Well all I can say is that I love my guitar, no other word could describe the feelings I have towards my guitar. It's not the best looking or the best brand guitar but when I play it, everything stops, I stare into space and unfold all the curtains that obscure or mangle my thoughts. It may...
  18. L

    Question about the physics behind a guitar string

    Why does pressing different positions on your guitar string produce different pitches? Obviously different pitches are caused by different frequencies, but is that change in frequency caused by the change in tension or the change in length or something else?
  19. S

    Nylon fiber guitar string sound

    Why does the sound of an old nylon fiber guitar base string on the guitar become suddenly "livelier", or "brighter", after being loosened and then retightened back to its normal tuning?
  20. C

    Moving On From Beginner Guitar: What's Next?

    Im learning to play the guitar, have a really nice sounding spanish acoustic guitar by gb&a. I can play chords pretty well, and play some leads too, but I don't know what songs to move on to. I've been able to play dance of death (a little slow on the leads), stairway to heaven, wish you were...
  21. B

    Calculating Wave Velocity, Mass, and Wavelength of a Guitar String

    Homework Statement A. A typical steel B-string in a guitar resonates in its fundamental frequency at 240 Hz. The length of the string is 0.680 m. What is the wave velocity in the string? B. The tension in the above string is 86.8 N. Calculate the mass of a 2 m long piece of the steel...
  22. B

    Fundamental frequency and tension of a guitar string

    Homework Statement In order to decrease the fundamental frequency of a guitar string by 4%, by what percentage should you reduce the tension? Homework Equations f = sqrt [T/(m/L)] / 2L I believe that is the equation that relates frequency to tension... The Attempt at a Solution...
  23. R

    Standing wave on a guitar string

    Homework Statement A guitar string is vibrating in its fundamental mode, with nodes at each end. The length of the segment of the string that is free to vibrate is 0.380m. The maximum transverse acceleration of a point at the middle of the segment is 8700m/s^2 and the maximum transverse...
  24. Mk

    What should I consider when purchasing a beginner acoustic guitar?

    I want to learn guitar, and I'm assuming the best first step is to have a guitar. What is it that I should look for in a first (cheap) acoustic guitar?
  25. B

    How Do You Calculate Guitar String Length and Fret Placement Based on Frequency?

    Homework Statement Work out the length of a guitar string, and where the frets will be placed from nut to bridge given the starting frequency. Frequency = 82.4Hz (E) Homework Equations 12√2 between each fret v = fλ v = √(T/u) u = m/L L = (1/2)*λ The Attempt at a...
  26. D

    Polarization of a Guitar String

    Hi everyone, When a guitar string is played its motion of displacement can be considered in two planes horizontal and vertically. With consideration of the nut and bridge of a guitar (ends) I've been told their their terminating conditions be different? How does the motion cause a...
  27. K

    World's largest guitar - frequency of vibration

    I have a problem on my sheet that is confusing me. The problem states The world's largest guitar, which was built by high school students in Indiana, has strings that are 9.0 long. The fundamental vibration that can be induced on each string has a wavelength equal to twice the string's length...
  28. R

    Understanding Music Theory: Guitar & Piano

    I am not sure where this is exactly suppose to go but I need some help with the mathematics behind musical theory. I searched the forums and didnt really find a related topic. The instraments I play are guitar and piano. I recently started the piano though and it made me question many things...
  29. D

    Bending Guitar Strings: Learn How to Make a Synth Effect

    Hi everybody I’m currently making/coding my own guitar synthesiser and I are interested in creating a 'bend' playing effect. By modifying the tension of guitar strings I presume I will be able to change the rate in which sounds travels in these strings. From playing guitar myself I thought...
  30. Math Is Hard

    What Made This New Year's Eve Party the Best for Bass Guitar Fans?

    Ah Nostalgia! Best new years eve party I ever spent was watching Barney Wolfe execute a fantastic bass solo at a Lord Tracy show:
  31. B

    Guitar string standing wave

    A nylon guitar string has a linear density of 9.0 g/m and is under a tension of 180.0 N. The fixed supports are L = 80.0 cm apart. The string is oscillating in the standing wave pattern shown in the figure. Calculate the speed of the traveling waves whose superposition gives this standing wave...
  32. M

    Resonance frequency of guitar string

    A guitar string resonates at 1260 Hz and 1575 Hz with no resonance frequencies in between. Find its fundamental(the lowest) resonance frequency. I know that fundamental frequency is the number of times it completes in one second, measured in hertz. In this specific problem, should I be...
  33. N

    A shirt that plays the guitar

    All you guitar enthusiasts, here's something for you... http://www.smh.com.au/news/technology/air-guitar-down-to-a-t-shirt/2006/11/13/1163266457568.html Check out that video! :bugeye:
  34. N

    Help with physics of carbon fiber guitar case suspension system

    I'm developing a range of carbon fiber cases for guitars, violins and laptops. The cases have a suspension system of high density closed cell foam pads which hold the instrument where it is strongest eg base of the body, where the neck joins the body. It has been suggested that it would be...
  35. A

    Badinerie-Composed for electric guitar?

    Badinerie-Composed for electric guitar?? Actually, this is not an utter blasphemy, the guy has some skill: [PLAIN][/URL]
  36. D

    The Mystery of Standing Waves: How Do Guitar Strings Produce Sound?

    if a standing wave is a wave which transfers no energy, how is it that a guitar string produces a sound? because it produces it via a standing wave, and the sound is sound energy, so where does the energy come from?
  37. Cyrus

    Classical and Spanish Guitar Performances

    Since that damn thread popped back up, here is some real guitar http://video.google.com/videoplay?docid=6235991051852963406&q=classical+guitar -vals3 http://video.google.com/videoplay?docid=-1994835504362469704&q=classical+guitar -paganini...
  38. C

    Questions about electormagnetic driver for guitar sustainer

    Hi, I've had a good search around here and cannot find the answers to my questions elsewhere on the forum so here goes... I'm getting ready to build a 'sustainer' for electric guitar based on developments described in a monster thread on the project guitar forum...
  39. S

    What causes the vibration of one guitar string

    My friend brought up this concept somehow and I know the answer, I just CANT remember what it's called. Sounds silly, I know. But anyways perhaps someone here can help me. What causes the vibration of one guitar string to be the same frequency of another one that has been plucked on that...
  40. L

    Guitar String Tuning: A Worthwhile Calculation?

    Ok so I've tried lots of searching ...but... it doesn't seem to hone in on my thinking which isss... I play bass guitar and different people have different views on how much to stretch their strings to attain alevel where their style of play wil allow the strings to bend and sound great...
  41. D

    Software to code for guitar sound

    Hi, I have downloaded a software to code for guitar sound, it's great, sounds cool but I don't know anything about guitar notes. Do you have any tutorials for aguitar newbie?
  42. D

    Help with frequency response of guitar tone circuit

    The circuit of interest is the basic circuit for a Fender Stratocaster guitar. A diagram can be found at http://www.seymourduncan.com/support/schematics/S_1singlecoil_1vol_1tone.html . Basically an electric guitar works by vibrating a metal string in a magnetic field. This in turn causes a...
  43. W

    Demystifying Guitar Pickups: Understanding Humbuckers and Eliminating Buzz

    This might a little too obscure, but something that confuses me about the guitar is the pickups. I understand how they work, however there are certain types of pickups, called humbuckers, where instead of having 1 coil of wire in the guitar to emit a magnetic field, there is another one.. The...
  44. E

    Fundamental frequency of a guitar string?

    Question: One of the 63.5-cm-long strings of an ordinary guitar is tuned to produce the note {\rm B_3} (frequency 245 Hz) when vibrating in its fundamental mode. 1. If the tension in this string is increased by 1.0%, what will be the new fundamental frequency of the string? The first part of...
  45. A

    Determining Amplitude of Standing Wave on a Guitar String

    A guitar string is vibrating in its fundamental mode, with nodes at each end. The length of the segment of the string that is free to vibrate is L. The maximum transverse acceleration of a point at the middle of the segment is a and the maximum transverse velocity is v. What is the amplitude...
  46. A

    Electric guitar amp speaker rounding

    I figure electric guitar playing physics people might know how to answer this. Can speaker rounding be achieved at lower volume levels, without going to a low power amp? I have a 60 watt combo with one 12" speaker rated at 70 watts. It can get pretty loud when I try to get that nice...
  47. B

    Distinguishing between strummed and plucked guitar strings

    My thesis requires that i tabulate a guitar input (recorded in wav format) and then processed to obtain its respective tablature... However, i couldn't find the right algorithm to distinguish if the note played is strummed or plucked... please help me! Here are some things I've learned...
  48. A

    Why didn't you just buy a guitar case?

    Even as I type this note, my fingers are sticking to the keys. "Why?" You might ask. Because I decided to build a guitar case. :cry: That should be easy, I thought. It's just a hinged box, I thought. Cover it with some leather-like material and "voi-la" (sp?) you have a...
  49. wasteofo2

    Electrical Shocks from My Electric Guitar: Possible Causes and Solutions

    My guitar is shocking me! I play the electric guitar, and for the past 2 days, I've been getting electrical shocks from it. I don't know if anyone here has enough knowledge of electric guitars to help me out with my problem, but I figure it's worth a shot. Anyway, the basic principle behind...
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