A great resource for guitar players, this site provides a lot of music theory, how to play chords, how to improvise and more. On the download page there is a chord calculator that displays the notes of many chords.

Enter a world of music in Artopia. Here, you can become a music critic, meet a musician, play a game, and even compose your own remix music in the virtual music studio.

This website is a cornucopia of resources for percussion instruction. There are videos, audiocasts, podcasts, interviews with talented percussionists. Please check out this website is you are interested in any aspect of percussion.