Skyro - A gorgeous voice recording app with embedded images
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
Quick Record - Voice memos audio recorder with iCloud sync
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Audio Memos - Audio Memos is a voice recorder for the iPhone and iPad.
StepMania - Rhythm game for Windows, Mac, and Linux.