GPMDP on PC, pulseaudio-dlna to Kodi on RPI, HDMI to my new AV receiver.
GPMDP remote control via chromebook & phone.
End result: Sitting on my couch, enjoying streaming Play Music radio through my stereo.
Last time I tried streaming system audio over UDP/TCP, it was a PAIN and had to be precariously set up via config files, and I still had to get up and go over to PC to change tracks/stations. Now it's a few point-and-clicks to choose which device gets audio from which app, and the music itself is remote controlled!