wireless aux

I have been working with a raspberry pi that I got a little while ago and got the pianobar pandora client. I was wondering if anyone knew of a sort of wireless auxiliary thing. A 2 way one that takes the music output and sends it via blue tooth or something similar to an input. I have my pi in a different room then thend my in home speakers and would like to keep it that way. Anyone know of a product along those lines? Thanks for the help!
Couldn't you just use a usb Bluetooth dongle?
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