Noiseblend - One-tap music for every occasion, with Spotify Premium
keezy - A colorful soundboard. Play with music.
Spotify - Map shows when two people play same song at same time
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
22tracks - DJ curated Spotify playlists on iOS
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.