Chime takes me back to the days when Lumines on the PSP was massive... possibly in some small sections of the PSP Puzzle Strategy community.
Ok, so Lumines probably wasn't all that well known outside of the PSP, but essentially you had 2x2 different coloured squares come down, much like tetris. You'd clear the board and score points when you build up 2x2 blocks of the same colour, when a line would slide across the screen and take them out.
In Chime, you don't need to worry about colour, but the pieces are all different configurations of 5 squares connected, much like tetris' 4 squares. You can move, rotate, and place them anywhere on the grid. The 'beatline' will move in time with the music, setting off events when it hits the shapes. If you have a solid blocks of 3x3 or more, they will disappear after a short while, give better music samples, and stamped down a completed section on the grid. The aim is to get 100% coverage on these grids before the time runs out.
This game is great if you want to fill in time, or if you're into mixing a few tunes with samples based on how well you play. Probably a small cult following for that. In the end, since there are only 6 or 7 level/songs to play, it only becomes a grind to try to get 100% coverage on each level, not really much more than that.
Pretty good if on sale, not really something to put in a wishlist though.