Spotify

Spotify provides users with a free, legal music library of more than 13 million tracks.

The service represents a revolution in depth of catalog and ease of use; users can stream music and also access up to 3,333 tracks off-line with Spotify’s premium service, ensuring that a user’s music is constantly available. Users can also create and share tracks and playlists directly and through social sites like portfolio company Facebook, and collaborate on lists with friends.