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Spotify's radio is a 10-song loop, another service w/ better radio and same price would definitely steal some users.

Google Play, for the kind of music I listen to, seems to have the best radio feature.

I've always had great results from Google Play Music. There are a couple things that could be improved, but I'm big user of it.

Disclaimer: I'm a Google employee (but I've been using Play Music since long before my employment)

Pandora?

Pandora is only available in the U.S. right now