Also known as the "Social Music Revolution"
Person 2: It was my kid sister, I swear.
"Awesome, I have 15600 plays!"
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 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