Falacy's link is a self-playing Super Mario World level, with the twist that it's creating sounds that go along with ((weird) Japanese) music being played at the same time. It's quite a clever take on the concept, and a lot of work went into it because it takes about 11 minutes.
Kaiochao posted a link to a song made in ModPlug Tracker that uses only Windows 98 and XP sounds for its samples. Also very clever.
