True, there are people constantly judging a musician, even people who have no understanding of the art; however, when a musician is really really good, all that practice pays off in big ways (full stadiums, fame, riches). The best programmers of our age are not celebrated with even remotely the same amount of fervour.

Additionally music is recognized as a legitimate, serious form of artistic expression. Complete strangers can have deep conversations over people they've never met and techniques they don't understand. If you bring up programming as an art form, a lot of people will just laugh. Start talking about closures and their eyes glaze over.