If you still haven’t settled on a streaming music service, Pandora has something to show you: it’s now letting people in the US try its Premium service – which usually costs $9.99 a month – at no charge… well, almost. To use it, just fire up the app and login with your free account, and then search for any song, artist or album. You’ll see an option to hear the track on-demand after watching a 15-second video ad. But your experience isn’t just limited to a single track: watching the ad unlocks Pandora’ full set of Premium features and content,…

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