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The Echo Nest
Apple AirPlay
See our full review of the desktop version, iPhone version, and iPad version. Also, note: the free version for iOS and Android now lets you listen to free Spotify Radio in perpetuity; you can upgrade for on-demand listening.
Slacker is available for free, but a subscription fee removes advertisements and adds unlimited song skips, lyrics, mobile caching (that lets you play stations offline, even without a connection), and an ABC News station.
1/11/2012 update: The following ...
Note: You'll need a Sirius XM subscription to use the apps once the free trial runs out, which adds $3 to the monthly subscription price of $13.
If you have any familiarity with interactive radio, you probably already know Pandora Radio, which counts every tenth person in the United States as an active user. The California-based service, created by The Music Genome Project, has cemented its place ...
