Sites offering music theory, both specific and general, are listed here. Music theory is "a branch of study that includes many different methods for analyzing, classifying, and composing music and the elements of music." (You will find a good writeup of music theory at http://en.wikipedia.org/wiki/Music_theory ) Music Theory is not Musicology. Musicology seeks answers questions for Who, What, Where, When and Why questions. Music Theory seeks answers for How.