I started getting into Jazz and what not, and have finally figured out what a Real Book is. I notice that they make a bass clef version, and then other arrangments. Which one would I want if I am jamming with a guitarist and keyboardist? I was thinking of getting the one for piano (would that be the one in C?) because they could use it to play the song, and I can construct the basslines off the chord progressions..or should I get both? I appreciate the insight!