Money wise, bad idea!
1000 people doing editing, generating, regenerating, partial rendering songs in the backend (servers), at the same time, will cost PG Music millions of dollars in Cloud CPU/RAM and bandwidth each year.
Trust me, it's much worse than 1000 people watching NetFlix at the same time.
Also, selling a $10/month subscription, so people won't buy the $500 software?
The CEO will be fired immediately.