keezy - A colorful soundboard. Play with music.
22tracks - DJ curated Spotify playlists on iOS
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Spotify - Map shows when two people play same song at same time
Splice - Music creation, collaboration, and sharing made simple.
8tracks 3.0 (iOS) - Refreshingly human music playlists