Several of the best mathematicians I've met had degrees in music theory; there's a surprising practicality to it in modern CS as the concepts translate well to machine learning.

This may very well be true, but I'd rather make an argument against this idea by pointing out that the relative worth of a field of study is not related to whether or not majoring in it will get Facebook to pay you $200k out of college to help them build out their marketing panopticon. It's disturbing how many people on HN don't seem to get that (not necessarily you, but other commenters in this thread are exemplifying this). It's good to have people who study art and music and philosophy and design because those fields enrich the human experience, and because the world would be a worse place without them.

At HN, “worthless” == “Can’t score a $100k salaried job out of college with it”