Last.fm: is a music recommendation service that displays to other members what you are listening to and vice versa.
From their site:
Last.fm is a music recommendation service. You use Last.fm by signing up and downloading The Scrobbler, which helps you discover more music based on the songs you play.
A scrobble is a little note The Scrobbler sends to Last.fm to let us know what song you’re playing.
Scrobbling helps us tell you what songs you play most often, which songs you like the most, how much you’ve played an artist over a certain amount of time, which of your friends have similar tastes… all kinds of stuff. By focusing on the music you already play we can help you discover more music.
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I enjoyed subscribing to Last.fm I and my circle of friends usually have the same preference when it comes to music. So every time this service recommended me something, I'd readily try it out.
Yes Last.fm is a great tool that connects like-minded people. It's always cool to find out the music that your target audience listens to.