This is actually something Spotify has, that I used to use before switching to Pandora. Basically you can listen to music through your PC, but control song selection, likes, skips, etc. through your phone. Let me explain how/why it was useful: You're playing a full screen game on your PC and you want to listen to the in-game sounds but also your music so you plug in your headphones and open pandora.com or your desktop pandora app. You want to give a thumbs up to a song/switch the song/skip a song. You can't close out your game or exit the full screen, so you do it through your phone, which is mirroring your pandora on PC.
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