Is there some program that teaches all this mumbo-jumbo that other commenters are using so freely in their comments? Ideally one which looks kinda like a game with scores and achievements. My understanding of music is quite basic, I know what the 12 notes are and that the "zero" of the frequencies starts at 440 Hz (but since everything is relative, it doesn't really matter that it's 440, it could be anything, but if…
I think Duolingo has a music course. No idea how good it is though or how deep it goes into theory.
It does teach a little anout scales. It wont teach chords. It doesn’t go very far into time signatures. It only has you play a virtual keyboard so it’s useless for learning how to feel your instrument.
It’s quite fun. My kid plays it every day and it’s helped get them feeling more confident to sit at our piano and noodle around. As a noodler myself, this seems valid.
It wont get you good enough to play pieces with other musicians, or to compose with weatern harmony. You’ll need extea tutorials for those.