Great news idorts! I managed to find the .IPS file for this hack. Patched up the ROM and gave it a try (it definitely works on ZSNES).
http://rapidshare.com/files/137403545/Super_Mario_World__Kumikyoku_Hack_.smc.html
DO NOT TOUCH the controls after you begin a stage or it will fuck up. For some reason, it doesn't always work, and Mario dies unexpectedly during a stage. There is more than one stage, BTW. Not sure what songs they are supposed to emulate.
Enjoy! Good luck trying to start the Nico Nico tune at the exact proper time while the game is running.