Instructions: Enter BPM into the text field or hit "b" repeatedly (at least 5x) on beat to autodetect the BPM. Then adjust the phase slider until the animation is in sync. Press space to toggle the disc spinning animation.
This is a "Party version", sorry for lack of polish :P
Original by Dwight (http://djpon3.dwighthouse.com/), But the JS code was heavily modified by me (Medo) to allow smoother animation and stable timing. DJ P0N-3 and My Little Pony by Hasbro.