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Spotify

Spotify is a free music streaming media player on which whole albums can be streamed with playback occasionally interrupted by adverts for unsubscribed users. It's also has inbuilt last.fm scrobbling. This tag is used for artists and albums that are available on the service which has a ever growing library of over 15 million tracks. Other features of the service include being able to create and share playlists with other users which can be made collaboratively.