Sick Moves, a dance practice player with a memory for the hard parts

Field notes

The player treats rehearsal as a timing problem rather than a generic media-playback task. It can detect tempo and bars, let users reposition the first beat, repeat one to four bars, speak counts over the video, and compensate for reported Bluetooth delay. The site also describes project saving and sharing, with files kept on the user’s device; the visible interface includes separate song, video, and project-opening actions.