Check out this amazing Multimedia Music Dictionary that I was recently referred to by another teacher. It was developed by students at Virginia Tech last year.
Thousands of words include not only the definition, but also a pronunciation guide and an audio clip so you can hear what the word sounds like. (I’m sure I could have avoided a number of embarassing mispronunciations if I had been able to utilize such a resource several years ago!)
Each word also references suggested listening examples, all of which may be found on one of four “Musical Example Bank” CDs. What a tremendous resource!