Spotify - Map shows when two people play same song at same time
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.
Magic Playlist - Get the playlist of your dreams based on a song
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
tradiio - Reward-based music discovery app