Question

how can i start to measure the resonance of sound in a live setting?

Answer 1

I'm not particularly sure what is meant by resonance of sound here... sound doesn't really have resonance. Objects that CAUSE the sound have resonance... like for example when you blow over the top of a bottle it makes a high pitched sound because the air inside the cavity vibrates at a frequency you can hear. Or when you pluck a guitar string the string will vibrate at it's own natural frequency.... this is what is known as resonance. I suppose you can find the resonance of any object simply by getting it moving somehow (either hitting it or plucking) and then letting go of it.

Answer 2

can you measure the natural frequency of the guitar?

Answer 3

You can measure the natural frequency of anything assuming it makes a frequency you can detect somehow.... whether by listening to it (~60Hz to 20000 Hz) or some other piece of technology.

Answer 4

are there currently tech i could build or purchase to do this?

Answer 5

I'm assuming you're thinking of just like solid everyday objects here.... in that case all you need is a decent microphone and a computer to process the sound signals.