Actually the opposite is true in my experience. Many engineers, physicists, and especially mathematicians are interested in music theory and/or play instruments themselves.

A classmate of mine, who is like the “Kyle” stereotype of monster energy drinking gamer, is also an engineering student who happens to be a virtuoso on the cello.

I think four members of my research lab play piano, two can play the violin iirc, and our advisor plays guitar.

So, you have never read Hesse it seems
Pretty much the essence of at least quite some books of him is, that music and math are basically the same thing