Custom Music hack/program for Wii Music?

I've been using the Homebrew Channel for a while now, and I love the codes it has. I was just wondering, is there any sort of program, hack, or cheat in general that will let me put my own tunes into the game? Like putting notes on sheet music, a piano roll, or any sort of note implementing. (For example: I'd put most of the notes to Megalovania on there, and then another song will pop up in the menu saying "Megalovania", or something)

It could potentially be possible to add or replace music in the game using something like Riivolution, but it's not as simple as you are suggesting. You would have to reverse engineer how the game plays its music and the create your own music in that format.