A friend gave me a DS emulator with the Taiko no Tatsujin DS rom. I tried to emulate it. And it works almost at 100%!!! Everything was perfect, but the game's pretty laggy. But you can hear most sounds perfectly, and there's no picture problem!!! It gives you a nice preview of the game.
I got some screenshots of my emulation :
I don't really know if I can give you the rom + the emulator. I could maybe get banned from the forum.
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Current Taiko 7 rank : Tai Tatsujin
the new no$gba (the one that now costs like $2.50)
emulates it pretty much perfectly, in choosing your name and song selection it gets laggy, but in game it goes perfectly!
(you'll have to go into emulation setup and try a bunch of different NDS cartridge backup media options to not get the error message when you start the game, or for any game that matter)