Nice little musically themed game on Steam, similar to Lumines.
http://store.steampowered.com/app/62100/
Reviews (for the Xbox360 version) are here:
http://www.metacritic.com/game/xbox-360/chime
http://store.steampowered.com/app/62100/
Reviews (for the Xbox360 version) are here:
http://www.metacritic.com/game/xbox-360/chime