Cost: Free with commercials; $4 a month for commercial-free listening and unlimited song skipping; $10 a month for on-demand songs.
How it Works: Create stations, listen to more than 150 preset channels, and, with the $10 version, put together playlists from the catalog of around 10 million songs.
Cool Perks: News and music-festival broadcasts available; listening on mobile phones doesn’t require cell-plan data use.
Drawbacks: You can’t integrate your own songs into playlists; few people use the service with Facebook or Twitter.
Best for: Contemporary-music fans who are looking to rock out on their cell phones.