This General MIDI disk correlates directly to the pieces in Piano Lessons Book 4. All track numbers for use with the GM disk are clearly indicated in the book, and are included with the GM disk packet as well. These fully-orchestrated accompanimnets by Hal Leonard Student Piano Library method author Phillip Keveren are a delightful way to enhance students' lessons, and are a sure way to guarantee practice success! The Piano Lessons GM also corresponds to the activities found in Piano Practice Games Book 4.