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It's a music app. I thought that much was obvious.

Can I pair it with my Zune?

yes, directly through the Windows Phone using a Silverlight 1.0-enabled appliance

Seeing the name Silverlight in the wild did untold psychic damage. Excuse me while I crumble to dust.

I think it’s an Adobe Flex app now.

Pretty sure you can just ask Cortana to pair Xbox Music with your Zune.