9 songs with accompaniment tracks so instrumentalists can play along with a real band. The tracks can be accessed online using the unique code inside each 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. Songs include: Climb Ev'ry Mountain • Do-Re-Mi • Edelweiss • The Lonely Goatherd • Maria • My Favorite Things • Sixteen Going on Seventeen • So Long, Farewell • The Sound of Music.