Tune My Music - Transfer Playlists Between Music Services
Magic Playlist - Get the playlist of your dreams based on a song
HotMusic - HotMusic is the best music service to discover songs from your favourite genres RIGHT AFTER their...
Spotalike - Spotify playlist with similar songs, according to Last.fm
Spotify - Map shows when two people play same song at same time
Playlist Machinery - Tools that help you create & organize your Spotify playlists