I've been working with play-along CDs and doing improvising, along with working with a lot of the books recommended in this forum, like Levine's Jazz Theory book, Coker's Patterns for Jazz, and a few others. I'm still a bit of a beginner, but I want to start to learn some tunes that I can actually really work on that will challenge me a bit. The tunes in the play-alongs are easy - although the improvising is definitely a challenge. Are the Real Books to advanced for me at this point? I have the Charlie Parker Omnibook, but I'm not ready for that yet.