The Hal Leonard Classical Play- Along series will help you play great classical pieces. Using the Amazing Slow-Downer technology included on the CD (adapted for PC and Mac computers), you can adjust the recording to any tempo you like without altering the pitch. Listen first to the full performance tracks to hear how the piece sounds with an accompaniment, and then play along using the accompaniment tracks. Hal Leonard Classical Play-Along is an effectice and time-tested method of practising.