You kinda answered your own question: YouTube is the site for this & unless it’s really good (or spectacularly bad) no one cares about music from random people.
One factor is programming is all random people. There is really no Beyoncé or Taylor Swift of programming that everyone in the world knows.
A random developer saying “hey checkout this npm package I wrote to do XYZ” is something that could directly be useful to people in their own projects or in the future.
That is probably the point. A random post about programming from a random guy can be potentially useful for one's own projects in the future. So I can project myself in the project of someone else when reading HN (sorry my english is not good enough to express clearly what I mean).
This is probably less true for music, except if you are really really moved by a song, to the point it could change your life (this can happen a few times per decade or per year but not so often)...
Why do we care about programming tech projects from random people, and nobody would care about music from random people?