22tracks - DJ curated Spotify playlists on iOS
Songstack - Swipe to discover new music for Spotify
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
Spotify - Map shows when two people play same song at same time
Cymbal - Music discovery powered by friends
8tracks 3.0 (iOS) - Refreshingly human music playlists