What is Rock: Definition and 345 Discussions

Rock music is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, developing into a range of different styles in the mid-1960s and later, particularly in the United States and the United Kingdom. It has its roots in 1940s and 1950s rock and roll, a style that drew directly from the blues and rhythm and blues genres of African-American music and from country music. Rock music also drew strongly from a number of other genres such as electric blues and folk, and incorporated influences from jazz, classical, and other musical styles. For instrumentation, rock has centered on the electric guitar, usually as part of a rock group with electric bass, drums, and one or more singers. Usually, rock is song-based music with a 44 time signature using a verse–chorus form, but the genre has become extremely diverse. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political.
Rock musicians in the mid-1960s began to advance the album ahead of the single as the dominant form of recorded music expression and consumption, with the Beatles at the forefront of this development. Their contributions lent the genre a cultural legitimacy in the mainstream and initiated a rock-informed album era in the music industry for the next several decades. By the late 1960s "classic rock" period, a number of distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, southern rock, raga rock, and jazz rock, many of which contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic and hippie scene. New genres that emerged included progressive rock, which extended the artistic elements, glam rock, which highlighted showmanship and visual style, and the diverse and enduring subgenre of heavy metal, which emphasized volume, power, and speed. In the second half of the 1970s, punk rock reacted by producing stripped-down, energetic social and political critiques. Punk was an influence in the 1980s on new wave, post-punk and eventually alternative rock.
From the 1990s, alternative rock began to dominate rock music and break into the mainstream in the form of grunge, Britpop, and indie rock. Further fusion subgenres have since emerged, including pop punk, electronic rock, rap rock, and rap metal, as well as conscious attempts to revisit rock's history, including the garage rock/post-punk and techno-pop revivals in the early 2000s. The late 2000s and 2010s saw a slow decline in rock music's mainstream popularity and cultural relevancy, with hip hop surpassing it as the most popular genre in the United States.

Rock music has also embodied and served as the vehicle for cultural and social movements, leading to major subcultures including mods and rockers in the United Kingdom and the hippie counterculture that spread out from San Francisco in the US in the 1960s. Similarly, 1970s punk culture spawned the goth, punk, and emo subcultures. Inheriting the folk tradition of the protest song, rock music has been associated with political activism as well as changes in social attitudes to race, sex, and drug use, and is often seen as an expression of youth revolt against adult consumerism and conformity. At the same time, it has been commercially highly successful, leading to charges of selling out.

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  1. pinball1970

    R.I.P. Annie Nightingale (1 April 1940 – 11 January 2024)

    The voice of rock on UK radio along with John Peel and Tommy Vance. First female DJ on the BBC in 1970 and hosted the Old Grey Whistle Test.
  2. H

    Favorite Electric Guitar Rock Solos

    You already know about Crossroads and Red House, so skip those. Etsushi Ogawa [ 小川悦司 ] I like the way this builds so gradually. You also get to see Senri Kawaguchi wearing a Peter Pan collar. John McLaughlin -- Tokyo City Girl I dunno that anyone else will like this but it's my fave...
  3. dwinkley

    Rock falling down a tunnel

    all i could accomplish was calculating the distance between P and the ceiling in a horizontal line(6)
  4. C

    Finding the velocity of a rock thrown vertically on Mars

    For this problem, The answer is ##6.28 m/s##, however, I got ##-314 m/s## and I am not sure what I have done wrong. My working is, ##H'(t) = \lim_{t \rightarrow 1} \frac{H(t) - H(1)}{t - 1}## ##H'(t) = \lim_{t \rightarrow 1} \frac{-1.86t^2 + 10t -8.14}{t - 1}## ##H'(t) = \lim_{t \rightarrow 1}...
  5. Hamiltonian

    Basic Stress and Strain question -- Rock on top of a vertical column

    a) I can find the compressive strain on the aluminium column using the formula ##\sigma = E\epsilon## as we know ##\sigma = F/A##. The area of the column is ##A = \pi r^2 = 0.126m^2## and the force on the column is ##F = 300*(9.8)N = 2940N##. The stress therefore is ##\sigma =...
  6. J

    B Archimedes Principle - A Rock and Water Magic Trick

    I understand how to measure specific gravity of a rock. One weighs the rock then tares a beaker of water and then suspends the rock on a string to observe the “weight” gain of displaced water. My brain however could never get how, without adding a drop more water or adding the mass of the rock...
  7. C

    Placing rock under ladder to stop it from slipping

    For part(a) and (b), The solution is, Can someone please explain the solutions to (a) and (b) to me? I don't understand where they got 5.77 cm from. Many thanks!
  8. Astronuc

    RIP Jeff Beck (78), virtuoso rock guitarist

    Jeff Beck, the British guitar virtuoso who rose to prominence in the 1960s as a member of the Yardbirds and later embarked on an acclaimed and prolific solo career, died Jan. 10. He was 78. https://www.msn.com/en-us/entertainment/news/jeff-beck-virtuoso-rock-guitarist-dies-at-78/ar-AA16eqam...
  9. C

    Calculating Trajectory Equation of Motion for a Rock Touching a Wall

    I tried to write a trajectory equation of motion.$$x(t)=vcos\alpha t$$ $$y(t)=vsin\alpha t-\frac{1}{2}gt^{2}$$from these we get:$$y=xtan\alpha -\frac{x^{2}g(1+tan^{2}\alpha )}{2v^{2}}$$For this problem:$$h=xtan\alpha -\frac{x^{2}g(1+tan^{2}\alpha )}{2v^{2}}$$ $$2h=(x+r)tan\alpha...
  10. D

    Questioning the Solution for Elevator vs Rock Problem

    Hi everyone I have solutions to this problem, but I am not sure if the premise behind them is correct. I think this is the reasoning behind the solution for question d. - Work out how far the elevator travels in the 7s before the rock is thrown, so 7x2.5 = 17.5 - Work out how far the...
  11. Aidan

    Meteorite or common rock?

    Hello! My friend found a rock on a beach near Ancona, in central Italy, and now he's convinced it's a meteorite. I have some doubts, however: it looks too cracky and porous. I'm attaching a few pictures of the rock: could someone give me an opinion? Thank you very much for the kind attention...
  12. Brav24

    Splitting Rock with Superficial Heat

    Hi. I'm an amateur mason - I currently use drills and plugs to split granite boulders. I've used sledge hammers, chisels and levers. I've dropped rocks, used hydraulic presses and tended fires to crumble and split rock. It's hard work. It's long hour work. I'm wondering if there's not a better...
  13. jim mcnamara

    Perseverance lander has a pet rock....

    Sort of. https://www.dailymail.co.uk/sciencetech/article-10897341/NASAs-Mars-Perseverance-rover-pet-rock-thats-hitching-ride.html
  14. Cramberamber5

    What kind of rock have I found?

    I found a round smooth like rock with orange and black stripes and it's magnetic Reference: https://www.physicsforums.com/forums/earth-sciences.84/post-thread...i don't know how to post picture
  15. pinball1970

    That Will Smith and Chris Rock thing

    <Moderator's note: Thread split off. You guys take your fight outside (the jokes thread) :wink:> A body language analysis gives an interesting breakdown of this. Not a moral judgement, just whether it was staged or not in his opinion.
  16. jim mcnamara

    Really odd rock formations

    https://bigthink.com/starts-with-a-bang/al-naslaa-rock/ Terse description with a lot of photos. Al-Naslaa wins my vote for the weirdest one.
  17. S

    I Trying to calculate the net force/torque of a rock climber on a wall

    Hey Everyone, I am working on making a simulation of a rock climber on a wall in 3D space. The end result is to help visualize the free body diagram of the climber and show how moving your limbs moves your center of mass and changes the forces on your hands and feet. I've been struggling to...
  18. T

    Mars - Igneous Rock, Exposed to Water, and with Organic Material

    A good candidate for the sample retrieval mission. https://www.nasa.gov/feature/jpl/nasa-s-perseverance-mars-rover-makes-surprising-discoveries
  19. K

    An odd rock from the beach

    I need help in figuring out what type of rock this is. I found it on a beach along the coast of Northern California.
  20. K

    B Rock Found in Field Turns Out to Be 4.6GY Old Meteorite

    A small fragment of rock found lying in a field in Gloucestershire in the UK may not have looked like much to the casual passerby ... I'm curious how this was found, if not by a "casual passerby". Did there happen to be a meteorite expert wandering in the Gloucestershire field?
  21. Ivan Seeking

    Where did old videos of rock groups come from?

    I have often been surprised to find music videos from the late 60s and early 70s, of people and groups like David Bowie, and The Guess Who. This surprises me because the first music videos I remember came along with MTV in the 80s. And I have often heard it discussed that MTV rushed in a new era...
  22. Astronuc

    B Phys.org - Carbon creation finding set to rock astrophysics

    https://phys.org/news/2020-10-carbon-creation-astrophysics.html Back in 2016 - Recent results in nuclear astrophysics https://arxiv.org/abs/1605.07810 From the abstract -
  23. aspodkfpo

    Rock climbing with forces along a "cam clamp" axle

    https://www.asi.edu.au/wp-content/uploads/2016/10/Physics_ASOE2015solutions.pdf Q`12b) Unable to understand how they deduct the relation between Ffall and N via the angles. Unable to tell why this would act along the axle of the cam to the point of contact with the rod and be relatable to each...
  24. Dman0500

    Dynamic Equilibrium -- Acceleration of a rock thrown from a bridge

    I know the acceleration of the rock is equal to g, but why. If we neglect air resistance, what is actually making the rock fall? Wouldn't it be that g overcomes the acceleration of the y plane at some point so the rock starts coming down or in this case accelerate more by throwing below 0 degrees?
  25. davenn

    I A new space rock to my collection

    I just love space rocks :biggrin: The latest addition to my meteorite collection NAME (LOCALITY): Huckitta, Huckitta cattle station, NT, Australia FALL DATE: Unknown, found 1924 (TKW 2300kg) CLASS: Pallasite, PMG-an WEIGHT g: 220.1g METEORITICAL BULLETIN: Never published in the...
  26. S

    I Isn't planetary rock dating really supernova dating?

    The age of the oldest rocks on Earth & Moon are about 4.5 Gy old. But doesn't the material that made the Earth come from the supernova that had occurred prior to the formation of the Solar System, and doesn't the radioactivity dating measure the age of the creation of that material in that...
  27. C

    Assistance with a rock identification 2 (southwest part of the U.S.)

    Hello, Could I please get assistance with a rock identification. I came across this one in the southwest part of the U.S. While I see a lot of slag from old mines, this rock appears to be something different than slag. Besides, it was the only dark colored rock I came across that day. It also...
  28. C

    Assistance with a rock identification (found in the Southwestern US)

    Hello, Thanks for providing a forum where people can share their education/passion and help others. Speaking of helping out, could I please get some feedback on this rock I came across in the southwestern part of the U.S.? I picked it up because it didn't match anything else in the area. It sat...
  29. R

    B Why doesn't the moon fall down if it's just a big rock?

    Is there an easy way to explain this to a 3 year old?
  30. D

    MHB The most basic of questions, sorry. Paper Rock Scissors

    Firstly I apologise for the most basic of questions... I want to know the odds for the game Paper Rock Scissors. What are the odds of winning What are the odds of drawing Thanks in advance :)
  31. D

    B Rock ejected from a spaceship

    I fly in a spaceship on a 2d plane (for simplicity sake) in zero G. I eject a rock 90 degrees right to my forward vector. What does the equation look like if I want the final vector of the rock? I know the final speed of the rock is 100. What variables need to be known about the ship and rock?
  32. S

    Circular Motion: Swinging a rock on a string in a vertical circle....

    Homework Statement :[/B] One swings a rock at the end of a string. We wish for the string to remain taut and for the rock to travel in a circulat path, in a vertical plane. What mathematical condition must the centripetal acceleration of the rock satisfy for the string to remain taut when the...
  33. C

    Distance traveled by a rock dropped off of a cliff....

    Homework Statement a rock is dropped off a cliff and falls the first half of the distance to the ground in 2.0 seconds. Homework Equations How long will it take to fall the second half? The Attempt at a Solution i thought if i took the square root of two and then subtracted that from 1/2t...
  34. DracoMalfoy

    Projectile Motion Kinematics: A catapult launches a rock....

    Homework Statement A catapult launches a rock with an initial velocity of 50m/s at 35 degrees above the horizontal. The rock must clear 3.5m at 10m away in order to make it over a castle wall to get to the enemy. Do the knights succeed? By how much do they clear the wall or miss clearing the...
  35. A

    Cone drill bit with threads to drill in hard rock formations?

    i designed a cone drill bit with right hand thread to give friction and grab inside to give pulling force. my question is can this type of cone drill bit drill hard rock formations like normal tricone drill bits with teeth or the cone drill bit will be weak to penetrate hard rock formations .
  36. F

    Spring and Rock Homework: Finding Separation

    Homework Statement Homework Equations U = (1/2)kx^2 T = 2 * π * (m/k)^ (1/2) The Attempt at a Solution [/B] T = 2 * π * (m/k)^ (1/2) T ^ 2 = 4 * π^2 * (m/k) k = (4 * π^2 * m) / T^2 So I know the initial potential energy is: U = (1/2)kx^2 U = (1/2)x^2 * ((4 * π^2 * m) / T^2) However, I...
  37. BillTre

    Sequestering Carbon Dioxide in Rock

    About possibly using peridotite to capture large amounts of CO2 out of the air. Nice pictures, very little chemistry. NY Times story here.
  38. M

    B Archimedes principle and the density of a rock

    Hi, so I have a problem that I am working on and I think that I understand Archimedes principle but the density that I am calculating is just absurd. The problem is as follows: "A geologist finds that a moon rock whose mass is 9.28 kg has an apparent mass of 6.18 kg when submerged in water...
  39. Monoxdifly

    MHB [ASK] How much velocity is needed for the rock to be able to hit that bird?

    A bird is located at the (50, 8 ) m coordinate. A boy shot a rock at it using a slingshot with the elevation angle 37^{\circ}. How much velocity is needed for the rock to be able to hit that bird? I substituted all known variables (including the gravity acceleration 10m/s^2, with...
  40. P

    Rock dropped inside of a moving vehicle

    Homework Statement A truck is moving at constant velocity. A rock is dropped from a storage compartment located at the midpoint of the ceiling of the truck. Where does the rock land on the floor. 2. Homework Equations Ax=0 The Attempt at a Solution [/B] The given answer states that the...
  41. J

    I If a rock fell 20,000 meters to Earth Question

    I was thinking about this question: So if a rock fell 20,000 meters to Earth assuming no air resistance and no other gravitational forces from anything but Earth, how long would it take the rock to hit Earth? Keep in mind acceleration is changing through the gravity equation as the rock gets...
  42. lpetrich

    I Compositeness Limits -- Have We Reached Rock Bottom?

    Particle Data Group - 2017 Review has some strong lower limits for the mass scales of possible quark and lepton compositeness, or at least the compositeness of the easier-to-study ones, like up and down quarks and also electrons. The limits are well into the TeV range, though they are somewhat...
  43. E

    A rock approaches a hill

    Homework Statement A rock approaches the foot of a hill with a speed of 16 m/s. The hill has a slope of 23 degrees, how far up the hill does the rock travel? Homework Equations KE = PE The Attempt at a Solution I tried mv2/2 = mgy but I know this isn't right since I don't use theta at all...
  44. G

    Force Questions -- Snooker ball collision and a rock through a window

    Homework Statement These are two conceptual questions we were given recently. It's strange how mathematically I regularly do much harder problems but these caught me out a bit Q1. If a one snooker ball hits another ball moving at constant speed, why does the second ball move? Surely due to...
  45. W

    Help ID a granite like rock

    https://drive.google.com/file/d/0B6vFDqtp6QNEOW9CeUFYOWRGczA/view?usp=sharing The pictures in this post are of a "hammerstone," or pounder. It was found next to a large lower grinder (metate, quern, whatever term you prefer). It is 11 cm high and 13 cm wide. It most likely cracked from heat...
  46. D

    Optimizing Your Chances in a Game of Paper, Scissor, Rock: A Strategic Approach

    Let's consider a game of paper, scissor, rock. We have two players: player A and player B. Player A always do paper; player B always uses a strategy, where he tosses a die, and if it comes out 1 or 2- he goes rock, if it comes out 3 or 4- he goes paper, and if it comes out 5 or 6- he goes...
  47. Asmaa Mohammad

    Classification of oil shale

    Could we classify oil shale as a biochemical sedimentary rock ? Oil shale is a muddy rock contains Kerogen. So I think in oil shale to be a mixture of Kerogen and mud sediments, and that's not the case, for instance, with the biochemical limestone where the solid remains of the living organisms...
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