If you want a music, podcast and audio platform for the Fediverse, you might want to check out Funkwhale:

➡️ https://www.funkwhale.audio

You can follow their official account at:

➡️ @funkwhale

Channels on Funkwhale can be followed from Mastodon, anyone can start their own server.

Given the situation with #Bandcamp, perhaps Funkwhale might be a basis for an alternative?

(I'm not a musician so I don't know how good a fit it is for artists and bands, but hope it is useful or could be developed?)