Last year the founder of Shazam told his story at a conference. That‘s a hit app. The effort that went into it is mind boggling. Far more than ever could possibly go into a single hit song.
I'm not talking about complexity but about the creative process, which is totally different. You can't apply SCRUM to the composition of a song. You can't set a deadline to it. You can't hire a junior musician and have him write parts for you. It is a much less rational and plannable process than software dev. Hence apple-to-oranges.