If you're a programmer, you have so much to bank on (the CS knowledge/degree) and even if you fail people will be pretty understanding. Try getting a good job in any industry with music skills and a GED.
At the end of the day, a technical stopout founder is taking a smaller risk (really, losing the college experience) for a bigger potential reward (billions) and attractive intermediate rewards (talent acquisition). And frankly, the odds of making it big as a programmer (industry celebrity-big) are not very different from the odds of making it big as a musician (standard celebrity-big).