you need to have dx2 cLSO installed.
Might work with other ISO though. As long as you can play the latest Kirby game, and the Zelda SS E3 demo, you are good to go
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan