Just thought this was weird. When I was practicing my trumpet I was going through my scales to warm up. I noticed this sound in the background and couldn't figure out what it was. When I was playing some songs I heard the same sound again. I soon realized this sound would only come when I played a B. It didn't matter what octave I played the B, it made a strange noise. I soon realized the noise was comming from my guitar. The sound waves making the strings vibrate. The weird part to me is that it only really made a noticeable sound when I played that B. Any ideas as to why?