soundseeder has google music and radio support, but not Spotify.
From my experience: syncing bluetooth speakers is hard, as they have their own playback delay, which even seemed to be slightly different every time I started a song.
Now I have 3 android phones with speakers connected via the headphone jack, thats running perfectly fine, once you have trimmed the playback delay in the app. You can adjust it in steps of 10ms.
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