Konami recently released their next music game called Mambo-A-Gogo where you play the mambos. It's actually surprisingly fun. There are only 3 mambos so on the easy level it's not so hard to track only 3 buttons. I played it for about an hour wasting time before seeing A.I.
It will be interesting to see if it picks up any fanatics because they way it gets harder is they divide the drum surfaces into 3 areas each. Front left, front right and back 2/3s. Medium level only splits the left most drum. Hard splits all 3. I'd really like to see somebody play a 5 star song on the hard level. It's got to be just amazing. Watching somebody play DrumMania at a hard level is also amazing.