I dont have an Apple Music subscription nor do i subscribe to itunes match. I've purchased music on itunes previously. It seems Homepod is able to directly play (via Siri) all my songs in my itunes/icloud library. Of course you can always use Airplay to play from one of your devices but know that you dont need apple music nor itunes match to play some of your itunes library. Maybe its just my purchased music that is automatically in my icloud account.