Noiseblend - One-tap music for every occasion, with Spotify Premium
Spotify - Map shows when two people play same song at same time
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
22tracks - DJ curated Spotify playlists on iOS
SoundCloud - Enjoy music & follow favourite artists
StreamForever - Create forever running video playlists