Doepfer

I loved this book.  It describes the physics of sound and how sound  
is produced by
various musical instruments.  It's a great source for physical  
modelling synthers.

The Acoustical Foundations of Music (Hardcover)
by John Backus   http://www.amazon.com/gp/product/ 
0393090965/102-3146998-9268930?v=glance&n=283155&s=books&v=glance
sfrules

PS.  Amazon offered it paired with a book by Harry Olson.  He was one  
of the designers of the Bell Labs Synth...