The game - Cool Cool Jam - Neo Geo Pocket Color | NGPC

Funny game. This game is about a boy and a girl who got 1000 years ahead in their own world. But they don't recognize him! Everything around is subject to .. music! And in order to return back to their normal world, they need to create their own musical group. You have to play all sorts of musical instruments and various melodies.

The game was also released on the Dreamcast.