The classic physics experiment involving sound, a tube of propane and fire. Created for Flash Forward 2006, but useful in any case where you are not allowed to have fire. I push through the tube 449 Hz then higher frequencies, then some jazz and then some rock. This is real life sound visualization.
Something about this (the voices? the violence?) reminds me a lot of Metalocalypse. It doesn't look like the creators or the voice actors overlap at all.