I've been learning music since March (when quarantine started in my country and I bought a keyboard to pass the time) and it's been by far the hardest subject I've ever attempted to learn (including pure math, programming, sports like boxing that were super out of my comfort zone, etc).

The vastness of genres and styles; The cross between mathematical patterns and raid and a completely subjective experience; the brutal amount of conventions and ideas that are simply centuries of accumulated historical baggage where it's not clear what's relevant and what's just used because changing the standards would be impossible...

It's at the same time super frustrating to learn, and an absolute blast.