The "Center for Computer Research in Music and Acoustics", (CCRMA),
Stanford University, USA
CCRMA provides a tremendous information base on musical aspects from basic aspects of sound to special aspects on modern digital sound processing.
Dominic Howman explains how musical instruments create sound and what is the physics behind.
An hour of rock-solid information chiefly focussed on guitar building and a wide range of aspects ...
https://www.youtube.com/watch?v=o0FT2nsg0sQ
The University of New-South Wales (UNSW, Sydney, Australia) has put together a lot of information on the physics of several kinds of instrument. In order to get some rock-solid information for your instrument beyond myths this WEB site is very recommended.
http://newt.phys.unsw.edu.au/music/
