[bryceneal]

Going back all the way to the '60s, if you listen to interviews with Paul McCartney of The Beatles he states very plainly that he knows no music theory, and can't read music.

I suspect this is true of many great songwriters, maybe even most of them. I would even argue that studying music theory may even make you a worse songwriter, because the most innovative songwriters don't seem to follow some clearly established rulebook, but rather they bend/break the "rules" unknowingly because their focus is on what they are feeling/hearing rather than something more analytical.

[munchler]

Paul McCartney deliberately avoided learning how to read music, but he understands music theory just fine. They are two different skills. It's quite clear from The Beatles' music that they know about keys, chords, etc.

For example, McCartney tells a fun story about The Beatles traveling across Liverpool to learn a single B7 chord in their early days: https://www.youtube.com/shorts/_r5B1AhP1Fo

[bryceneal]

I hear your point. I wouldn't personally consider someone who knows what a key or a chord is to be well-studied in music theory. Surely even Kurt Cobain understood which power chords he was playing, for example.

I was referring more to being well read in music theory in the academic sense. I am doubtful McCartney ever picked up a book on the subject. Traveling to meet someone so they can show you how to position your fingers so you can play a B7 chord is a bit different than that in my opinion.

[cue_the_strings]

I hate going into semantics like this, but I guess there's no other way.

Music - rhythm, harmony and melody - has patterns. Those patterns can be described / named. There are systems to also write them down.

When you mention reading / writing music and music theory, western notation and western music theory are what first comes to mind for most of us here. They are obviously not the only ways. Any one of us can trivially make our own systems, or adopt tiny portions of the western system. I have no doubts that people have done that.

From my personal experience, back we were teens, my friend group and I knew a tiny bit of theory (5ths, major, minor, 7th chords + pentatonic / blues scales) so we could use that in communication. The other thing we'd do is refer to motifs by citing them from songs, like "drum beat like When the Levee Breaks" or "strumming pattern like Where is My Mind). Or "for the brigde, turn it around like in Goddamn Lonely Love". Your group knows the same songs, and then you just cite that + show someone something on a guitar.

If you play with a wider group of musicians, a language likely starts to appear, and things get called fixed names more often. No doubt that all the blues people did it, the Beatles and that whole scene did it, ...

Now, if you're into music enough, and want to communicate with other musicians from different backgrounds and genres, it makes sense to just learn the regular western notation (because it's convenient for noticing harmony) and theory (because it has names for all the concepts). It's a bit infuriating that such fancy names ("dominant", "leading tone") are given to such seemingly simple things, but this is true of any jargon.

I've seen the equivalent with self-taught programmers, where they understand some CS concept, but can't name it properly. Maybe in your local demoscene, it got called something else, because nobody has formal CS knowledge. That was quite frequent before the internet, but still is possible when people do something as a hobby.

But for western music theory and notation, you can use it strictly descriptively and not prescriptively. Learn some, then transcribe your favorite songs, write down the progressions in roman-numeral-notation or something, figure out which scales are used, figure out how melodies fit over chord changes, ... Shame music education is closely tied to a classical (and / or jazz) repertoire in most places, it doesn't need to be.

But in any case, both playing well and writing songs obviously takes a lot of practice and effort, and you use whatever you have at your disposal to help. The "we don't practice, we don't care, this just comes out of our soul on its own" is plainly disingenuous, that's the most toxic part of it. But you can't write music without theory, at least your own pidgin theory.