AMAZING Super mario world "Song"

This is an amazing video I found on youtube:
[youtube:22a9zgjn]tIRCzbBB99E[/youtube:22a9zgjn]
This version is the same thing, but with some Japanese singing: (I think this is how you're meant to watch the video but I don't think it's as good :p)
[youtube:22a9zgjn]Xz0PaPpmGa8[/youtube:22a9zgjn]

At roughly 6 minutes in the first video is the Dr. Willy theme from Megaman 2. Didn't really recognize any others yet.

Nice Find :D These videos are awesome!