This video shows four different levels of Super Mario Bros. in which the sound effects were synchronized to play four different musical parts in the Queen song "Don't Stop Me Now." If that explanation doesn't make sense, it will about a minute into the video. Its origin is a little unclear, as the information is in Japanese. I'll update as I learn more.
Just a bunch of noise.
Whether its art or a "waste of talent", its something different that many of us never would have thought about before.