Q: Dongle for streaming

I have an older receiver for my surround sound system that doesnt have wifi integrated into it, is there some kind of dongle or something I can get to put on it where if I turn on the wifi on my iMac where all my music is stored that I can stream my music to the dongle or whatever on my receiver so I can play my music through my surround sound system?  Thank you in advance for your help and answers!