Learn and play! That is exactly the main idea of this music book PLAY-A-LONG by the JAMEY AEBERSOLD publishing house. It is destined for all musicians who want to learn or improve their improvisational skills in all tunes (one of the most important excercises in jazz)! Seven great evergreens where every single one is concerted into all 12 keys. The music book includes parts for all tunings (C, Bb, Eb, and instruments in bass clef). The attached CD is with a great "life" music accompaniment without a leading instrument or singing, so that melody and improvisation is waiting for you. For piano practising, right and left channel are divided-L-bass, drums and R-piano, drums). Very interesting and useful!