Vib Ribbon is the tale of Vibri (or as many game-sites and import gamers are affectionally calling him, "The Singing Crack Rabbit"). Vibri hops, skips, and jumps his merry way along an infinitely long line--the "Vib Ribbon." Like most people, Vibri finds it easier to keep moving if he's listening to music. But sound causes the fabric of the Vib Ribbon to mold and change its shape, like an oscilloscope gone horribly wrong. This creates obstacles in time with the music that Vibri (and consequently, the player) must avoid.
It may sound complex, but it's not and the gameplay makes far more sense when the rules are sung by our rabbity friend.