This compact disc set contains orchestrated background accompaniments for the pieces in the Accelerated Piano AdventuresÂ® Lesson Book 1. Each selection in the book is played twice: first at a slow practice tempo and then at performance tempo. The piano part is included in the slow track. For the performance track, the piano part is omitted or is in the background, allowing the student to be the featured performer. The Enhanced CDs also include standard MIDI files that can be accessed with a computer. When used with your software, keyboard, or synthesizer, the MIDI files allow you to adjust tempos, isolate track playbacks, and transpose to different keys.