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Assuming that “egotistical” was not included as a way to no-true-scotsman out of answers, there are billionaires who are musicians, so there is nothing about playing music that makes one immune to pursuing obscene and harmful levels of wealth:

Diddy, Taylor Swift, Paul McCartney, Andrew Lloyd Webber, Rihanna, and JayZ are all billionaires.

Morpheus, holding up a AA: “7 billion”