If you come across tracks, or even artists on Last.fm that you can’t listen to as they’re not available to play, but that have other listeners, this is because these users have scrobbled their own music files when listening to them with their own media player on their computer or mobile device.
By scrobbling your music, information about the artist, album and track names is sent to Last.fm, and based on this information many statistics, like an artist’s tracks charts or the top listeners are generated. You can read more about this here in the “What is scrobbling?” FAQ.
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