We bought it thinking it would be fun to play along to the classics. The back cover lists songs with their famed artists, like "I Love Rock 'N Roll" with Joan Jett & the Blackhearts and "Smells like Teen Spirit" with Nirvana. Unfortunately, the sheet music inside and the "Sound-Alike CD Tracks" are not in the same key of their famed counterpart.
The disc comes with a proprietary speed slow-downer lite, and there aren't any typical files that can be exported (i.e. Midi or MP3). Mind you, it almost didn't matter, seeing as how they weren't in the original key anyhow and also had no melody (vocals) to follow along with as a guide for beginners.
I can't recommend this product over the many better ones out there.