This post comes from the Google Product Forums.
Hello Google Home lovers,
We wanted to share some great news! All your feedback and suggestions have been heard and we are happy to announce that you can now listen to music you’ve uploaded to and purchased on Google Play Music.
On top of the subscription or free radio service, you can listen to music you’ve uploaded to and purchased on Google Play Music.
When asking for songs, albums, and artists from your library:
Free radio service (U.S. and Canada) – Uploaded/purchased content will play before the free radio station.
Subscription – Subscription on demand content will play before your purchased/uploaded content unless you ask to play it from your library using “Play X <from my library>.”, “Play my X”, etc.
A few points to note:
The “Play <genre/mood/activity>” basic voice command isn’t supported for uploaded/purchased music.
If Google Play Music isn’t your default music player, you need to say “Ok Google, play X <on Google Play Music>” to hear subscription/free radio/uploaded/purchased music. Only personal playlists will be prioritized above your default music player.
This feature is currently rolling out to all regions where Google Home is supported.