TW, checking Caravanserai at the moment:
Nope, still not on Amazon "Unlimited." The main reason I use that service is, it's the only one I've found that will just sit there and play for days on end without stopping. We use it for background music at the auto parts store -- it plays on an old computer that is used for virtually nothing else. All the other streamers I've tried will start bugging you with "Are you still there?" after an hour or two and then shut off if you don't answer. Disclaimer: I haven't tried the "paid" version of all of them. Sirius XM does the "Are you there" routine, as does Pandora. iHeart's free version does it too(and plays ads for competing parts chain, so they're out!). I haven't tried Spotify or Apple Music.