I found myself playing round after round even though I really stink at the game and had lots of results with 0 correct. Someone who is more of a music aficionado or an album art connoisseur could really get hooked on SongBlitz.
The JamsBio site also hosts another album cover game called JamsMatch. In this one you need to match 9 album covers with their titles.
You can play the games without registering. However, if you register you are eligible to compete for the top score every day and win $50 Amazon gift certificate.