Use HomePod with iTunes on PC
You can use HomePod to play music from the Apple Music catalog. After you set up your HomePod, it plays audio directly from Apple Music or audio sent from an iPhone, iPad, iPod touch, or Apple TV. See the HomePod User Guide.
In the iTunes app on your PC, do any of the following to play music:
Click the AirPlay button at the top of the iTunes window, then select the checkbox next to HomePod.
Whatever song you were playing in iTunes on your computer now plays on HomePod too.