If you want to use the Jukebox to test custom music out in-game (highly recommended), you'll have to add a header to the ROM. Headers are a remnant from the days when SNES cartridge dumpers were first being used, but some ROM hacking tools like EBMusEd were programmed with them in mind, unfortunately. 

Here's the tool I used - http://www.romhacking.net/utilities/400/