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The Frequency series was a trio of rhythm games made by Harmonix. Basically there are 5 - 7 note tracks and you shuffle between them (you're controlling a space ship) and hit the notes in the track. Once you clear a section of notes, you move on to the next track (each track represents an instrument). While this is going on, a special character you design called a Freq (right in Amplitude playing instruments, top left corner in Frequency dancing...ish) is there moving along with the beat.
Frequency and Amplitude (1 and 2 of the series) had a feature that let you remix all of the songs in the game. You could then upload it online and play it against others. The 3rd game in the franchise is Phase; a rhythm game for the Ipod. while it comes with ten songs, you can basically put any song you want in a playlist, and the game creates a chart for it (only one note track, rewind, select, and forward buttons are used, while the track pad is used for little scroll sections.
Recently, Harmonix released Rock Band: Unplugged for the psp. It is the same general gameplay as Amplitude, but with only the 4 main instruments of Rock Band, as well as more rock oriented songs.