-Modern Recording Techniques by David Miles Huber & Robert E. Runstein
-The Mixing Engineer's Handbook by Bobbi Owsinski
-The Mastering Engineer's Handbook by Bobby Owsinski
-The Yamaha Sound Reinforcement Handbook by Gary Davis & Ralph Jones
-Principles of Digital Audio by Ken C. Pohlmann
-Behind the Glass by Howard Massey
Those are some of the books that I have bought as a music technology major over the past few years. They are all great books and filled with good material. The Sound reinforcement handbook can get a bit technical, but it's not too bad. The Pohlmann however is heavy stuff, and I have to skip over some parts of it because I don't know anything about calculus.