Some revenue streams for artists and musicians…
Publishing
Streaming
Physical sales
Merch and bundles and limited editions
Digital sales
Performance royalties (PROs)
Master royalties
Advances
YouTube ad revenue
Brand partnerships
Patreon
Session work
Cameo-style/Zoom appearances
Sync licensing
Live shows- headliner tour, opener tour, private, cover, backing up other artists, college events, frats/sorority, festivals and fairs, live streaming, house shows, military tours
Teaching private lessons
Making sample packs or loops
Writing custom music for companies
Producing other artists
And many more. Each one of these can be broken down into sub groups and mined for more specific opportunities.