"Back in the 16-bit era Interactive media artist Toshio Iwai designed a SNES music composition tool that was to be released along with the SNES mouse in a bundle package, just like Mario Paint. There was even a US trademark filled for the game's western release under the name Sound Factory. Sadly, it never got released and has faded away from our 16-bit realities ever since.
"Until now, that is. A prototype cartridge showed up on eBay some time ago and the ROM was duly dumped. KiroBomber made it publicly available today"
from: Nintendo Life
As it says later on in that article, the sound and video together are mesmerising. It reminds me of some of the earlier experimental audio-visual stuff that Simon Reynolds blogged about a while back.
Would also fit right in as background music in Adventure Time.
See also the Actually Released Electroplankton (2005 for the DS).
A bit too recent? Not hauntological enough? Watch the vid - there's the Vision On mascot jumping up and down on a hexagon, right there!