Aebersold, Jamey: Blues In All Keys play-a-long (Book & CD)

Here's a great way to expand your blues playing in every key, and it's real fun too. These are slow tempos and are for all levels of ability. Try playing some of the tougher keys without looking at the music and see just how fast your ear takes over. You'll find yourself gaining confidence very quickly, and that confidence will greatly improve your soloing. Charlie Parker learned the Blues in all 12 keys before he learned anything else.