Baten Kaitos I : https://gbatemp.net/threads/baten-kaitos-ihd-remaster-1-0-0-tid-0100c07018ca6001-bid-c271afe5627d2169.639877/#post-10248733
Baten Kaitos II : https://gbatemp.net/threads/baten-kaitosii-hd-remaster-1-0-0-tid-0100c07018ca6002-bid-c6ef13a94e39d810.639890/#post-10249140
@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