Spotify will never do this because it will undermine their business model. They have huge fixed costs and those costs need to be covered by the money that should be going to artists... Broken system...

joemartinmusic

bitcoin

Releasing music on podcasting 2.0... Good idea..? 

I'm not sure if this is even possible, but it would be great to create some kind of app/addon that connects to spotify and streams sats to creators who want to get it. Big musicians probably won't care, and that's fine. But for small creators it can be interesting + fans can influence them to get into bitcoin and get direct support. 
Right now spotify pays around $0.0033 per stream (says google) = 20 sats. 