Frets on Fire - Bonus content.
keezy - A colorful soundboard. Play with music.
Rocksmith+ - Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.