Remember these Mega man songs?
Mega Man 3 - Top Man
Mega Man 2 - Boss Fight
Behold the glory that is this!
Game Over- Cataclysm Clash
The name of the band is Game Over.
Other songs they cover on their first demo are Castlevania level 5, Gremlins 2 level 1+3, Punch out main theme and game over music, along with the mario theme.
Check out the downloads section for the other songs.
For obvious reasons, my warning should be removed solely for this post.