A social community that revolves around music. A way for the world to see what music makes you dance around like a loony. The profile tells everyone what bands the user listens to, how many times they've played songs, and you can add images by BBCode that relate to music.
One of these images is Scaicha which records the genres of everyting you listen to and calculates a score.
There are many things one can do with Last.fm. It looks at what you listen to and recommends similar bands.
Person A: Who the hell are Eighteen Visions?
Person B: My top artist on Last.fm :)
Person A: I haven't heard of them!
Person B: Well Last.fm recommended them and I think they're awesome