How does last.fm "randomize" its songs?

After last.fm played ELP off my playlist, it proceeded to play Savage Garden, and is playing Midnight Oil as I type this.

I get a funny feeling that AC/DC is coming up...only because I haven't put any Olivia Newton/John in my playlist yet.

I'm not sure how last.fm determines which song should "randomly" come up in your playlist. And this is really bugging me, because I added "Til I Die" to my playlist, and it STILL hasn't come up yet. Argh.

P.S. The next song WASN'T from an Australian band. It was "Polly" by Nirvana.

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