Ive decided to get a real book as i have started playing in a jazz combo. i have heard that the Bass clef version does not have bass lines but just the melodies written in bass clef. I can read treble clef, not as fluently but i can, and also what is included in the "C" instrument real book? also i am going to get the 6th edition. So which book should i buy? bass clef, treble or concert C?