Get access to backing tracks to 240 songs from The Real Book Volume 1 so you can play along with a real rhythm section (piano, bass and drums) professionally recorded for these products. The audio is accessed online using the unique code inside each sleeve and can be streamed or downloaded. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.