[cue_the_strings]

A common thing w/ Nirvana songs is that Kurt plays power chords, and then has the thirds (+ other tones) in the vocal melody.

But also, it was just a (counter-) cultural thing to feign lack of music theory knowledge or practice at the time. Quite a destructive one, I might add.

A nice video about it: https://www.youtube.com/watch?v=pWY4YYmSTWg

[strunz]

Yes, Kurt falls into the "obviously knows music theory without knowing what things are called". He played by ear and had a gift for melody and chord tones. Rick Beato has great videos about Nirvana and Kurt's very sophisticated ear - https://m.youtube.com/watch?v=l1ZnWc-sFd0&pp=ygUNYmVhdG8gbml...