Giada - Giada is a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
JAM - Shake your sound - Music motion app. Make music by shaking your phone. 🎶
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Blocs Wave - A free audio app for creating music loops.
Frets on Fire - Bonus content.