Spotify already has proven itself a formidable competitor for Rdio, and the all-you-can-stream music service even matches up against iTunes with a subscription model versus iTunes' track-at-a-time sales approach. Now it's aiming the crosshairs at suggestion engine Pandora with a revamp of its Spotify Radio feature.
Spotify's current radio activates when you select "start artist radio" at the top of an artist page or generates suggestions via tags, but doesn't allow you to save stations.
