Streaming, rather than music files on the phone? Do you get any drop-outs or stuttering? I'm thinking it wouldn't work too well with the poor 4G coverage in some parts of Cornwall!
Alexa plays music from my wife's Apple Music account, via any one of our four Echoes. She also wakes us up with random tunes.
But when I want to hear my own (much rockier) music (ripped from CDs, cassette and vinyl), I'll play it through my PC speakers. Or phone/headphones if I'm gardening. Or...