With Vocal Complete, the sheet music matches the original key and form of the backing tracks, so if you practice singing with one, you won't encounter unexpected variations with the other. Upload the tracks to your portable music player for practice, performances, auditions, parties, or even singing for fun in the car! There are two versions of every song on the recording: a full-performance track with sound-alike vocals for listening and learning, and a professional-quality backing track for singing along. Also included is TNT (Tone 'N' Tempo) Changer software that lets you customize the key and tempo of each track to suit your voice and style. (The key changer modifies audio playback via computer only. The sheet music remains in its original key.)"