Hi all, I've been reading up on the physics of waves in order to better understand what goes on with sound. I'm having difficulties understanding how harmonics are produced in guitar strings. It's probably not as complex as I'm making it in my head, and it's really starting to frustrate me. This is the most important question that I have: - In order to create a standing wave in a string, you need resonance. How does resonance occur in the strings? From what I understand, resonance occurs when an object is set into vibrational motion at one of its natural frequencies by another object that's vibrating at that same natural frequency. I don't understand how guitar strings can resonate by just plucking them. "As mentioned earlier, all objects have a frequency or set of frequencies with which they naturally vibrate when struck, plucked, strummed or somehow disturbed. Each of the natural frequencies at which an object vibrates is associated with a standing wave pattern. When an object is forced into resonance vibrations at one of its natural frequencies, it vibrates in a manner such that a standing wave is formed within the object." I hope the answer to this question will answer all the questions that I have, or at least highlight what's going wrong with my thinking. Thanks in advance.