C Instruments Book with Online Audio Tracks-The Real Book you know and love has now been updated to include backing tracks for 240 songs accessed online for download or streaming! The Real Books are the best-selling jazz books of all time. Since the 1970s musicians have trusted these volumes to get them through every gig night after night. The problem is that the books were illegally produced and distributed without any reqard to copyright law or royalties paid to the composers who created these musical masterpieces. Hal Leonard is very proud to present the first legitimate and legal editions of these books ever produced. You won't even notice the difference other than that all of the notorious errorshave been fixed! The play-along files are accessed online using the unique code inside the book 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.