Spotify isn’t setting a market price, so I’m not sure what your argument is here.

Setting a market price means a band in really high demand can charge X dollars but a new band, that isn’t well known and doesn’t have high demand could charge X/4 dollars.

Spotify OTOH, charges exactly the same price to the user no matter what song they listen to, and the price is “Monthly cost/number of songs listened to”. Unsurprisingly, instead of leading to the promotion and creation of a whole new set of bands, which is what the democratization of tools and knowledge of music through the internet should have led to, this has instead led to consolidation because the removal of the market price and setting a flat structure means people continue to flock towards the songs that are perceived to be the highest value, ie the most popular stuff.