Reading this thread I don’t think people have grasped it!I don't get why people keep saying it's only for HomePod users. You can use Siri to ask your iPhone to play a certain song and then you can listen to the song with your headphones or even connect your iPhone to a speaker system either directly with an adapter or perhaps with bluetooth.
Whilst it’s not for me my two teenagers will often use voice commands to listen to one song or an album, either on the HomePod, Echos or CarPlay. I was getting all ragey because I wanted to play an album in the proper order the other day but they’re quite happy to dip in and out of songs as they choose. Different age groups, different needs.
it’ll be interesting to see if it takes off, I see it as an intro to the higher plans.