Noiseblend - One-tap music for every occasion, with Spotify Premium
22tracks - DJ curated Spotify playlists on iOS
Spotify - Map shows when two people play same song at same time
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.
StreamForever - Create forever running video playlists