originally, thurston tuned his guitar to open strings so he could play chords with one finger. i don't think he ever had any musical "training" beyond just tuning his guitar differently and playing by himself for hours. unless you're a complete jackass, you're going to "learn" to play guitar, in some way, if you play it as much as he has in over 30 years. I think he doesn't really understand much "theory", but anyone that plays for hours can come up with lots of great riffs if they know a little about what they're doing. Thurston definitely knows some chords but I don't think that really factors into his playing usually, except on Trees. He knows what's he's doing, let's leave it at that.
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