The latest Humble Weekly Sale is all about toe-tapping rhythm games, and includes some of the most enjoyable examples of the genre we've seen over the last few years (discounting games with the words "guitar" or "band" in the title).
Beat 61p to get Symphony, Sequence and the legendary BIT.TRIP Runner.
Beat £3.64 to also receive Audiosurf, Beat Hazard Ultra and Retro/Grade. Personally, I'd recommend Beat Hazard Ultra as the stealth highlight of the package, since it's an epic SHMUP that builds enemy fleets around your own music. Great multiplayer too- it's all in the review.
Thanks to GobbleTurkey @ HUKD!