Some people have too much time on their hands. Sometimes this leads to some interesting creations, like a custom Super Mario World stage that plays by itself.

If that's not good enough for you, how about an autoplaying level that syncs to some music?

If you'd like to see more of those... dont-move-hacked-mario-world-levels-play-themselves/

Or if you prefer focusing more on the music itself, let's enjoy some Mario Paint. (My favorite)

This one has a small bunch of other videogame tunes played the same way.

Enjoy. :)
Holy crap those are awesome!

The Mario auto-play level synced to the Haruhi Suzumiya theme was especially cool... And the Dr. Wily theme in Mario Paint was highly impressive...

I miss Mario Paint... :(
I spent the last two hours looking at these videos.

Now I really want to play Mario Paint, but I can't find my mouse! :(
hooray for hare hare yukai
In response to Maggeh
These are amazing. I even showed my parents and they were like.. WOW! >.>