7 You Can’t Use Spotify With It
While Apple has encouraged developers to begin creating Siri-compatible apps for HomePod, it’s limited those apps to three categories: messaging, lists and notes. Sadly, that means you won’t be able to ask Siri to play music through third-party services like Spotify.
That means you’ll need an Apple Music subscription to stream songs. There’s no telling whether or not Apple will eventually add third-party music support to Siri. On the other hand, you can use AirPlay to stream third-party music apps, and you’ll be able to play your iTunes library through HomePod, too.