Both of those use algorithms to find similar music to what you like, no?
I put up a list of bands from the past two years doing new things. I don't see how you can say a band like The Arcade Fire is retreading old ground: they're creating something genuinely new. There are plenty of refreshing bands doing new stuff. Fleet Foxes is named a lot to the point of monotony, but the publicity surrounding them doesn't change the fact that they are genuinely new and good.
I put up a list of bands from the past two years doing new things. I don't see how you can say a band like The Arcade Fire is retreading old ground: they're creating something genuinely new. There are plenty of refreshing bands doing new stuff. Fleet Foxes is named a lot to the point of monotony, but the publicity surrounding them doesn't change the fact that they are genuinely new and good.