Most of what I listen to on Spotify is not available. It is not that obscure.

Mike Pinto, Greensky Bluegrass, The Devil Makes Three, JJ Grey & Mofro, Jack Johnson, Dirty Heads... list goes on.

I guess I just listen to very mainstream stuff... the only in that list I have heard of is Jack Johnson. I guess it's fortunate for me that I have pretty vanilla tastes that Amazon seems to serve up.

Very fortunate from what i can tell. Looking at the top 100 albums in their "MP3 Downloads" section.. not a single one is available to stream via Prime