Hal Leonard Real Book 2 Bass Clef

I like a lot of the content in here. It seems to be one of the better and most useful 'real books', especially if you like the variety offered and you also need to - or wish to - use bass clef. I found it can be handy even if you often play a mid-pitched instrument using treble clef music, to have the bass clef version to try and then improvise from as well.