Not being a huge fan of retro Nintendo, I only recognised the Mario, Tetris and Zelda themes, the second and third ones escape me and I only got the Mortal Kombat one for obvious reasons. Still it did make me giggle quite a bit.
Nice bit of ocharstration really but I suppose it was already done for them, once you got the main melody the harmonies are fairly easy going seeing as they're usually (but not always) a third difference from the melody, major thirds always sound nice. (that musical part was as much for Jimi as anyone else

)