JW Pepper – A great site to check out jazz/concert and pepr band music.
Lots of audio clips on here.

Lush Life Music – Listen to many great Club Cougar charts right here!

Music Theory – Having trouble with your knowledge of music theory?
Do a few lessons on this site.

Jamey Aebersold – Jamey’s site is the #1 resource for jazz play-a-long books, fakebooks…pretty much all things jazz!