[sowhatquestion]

Hmm, I thought Google Play (and possibly Spotify as well) used OGG. MP3 is a very old format at this point.

[TD-Linux]

Spotify uses Ogg Vorbis.

Google Play uses MP3, which is kind of sad these days because Ogg Vorbis or Ogg Opus would both be much better choices.

[timothya]

Google Play Music seems to be streaming with MP3 for me, at least in Chrome on Mac (maybe the native apps are different?). I don't use Spotify so I am unable to test it (I updated my post to note OGG anyhow).