I'm one of those lucky people who can play by "ear", (it's a gift!), and music theory gives me a headache.
Give me any instrument, tell me a tune I know, and I will play it by "ear".
Whether it's a keyboard, hammered, stringed or blown instrument, I automatically know the correct fingering intervals to produce the tune...

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The only time it becomes a dis-advantage is when someone asks me to play a piece that I don't know, they stick a piece of sheet music in front of me and say "play this"...and then it takes forever, note by flippin' note...

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LOL...!
My music playing started in 1936 at the age of two, when I had to reach up to my Mums piano to tinkle the ivories.
..got a lot better at it now since then...

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I can't be arsed with instruction books, I just sling a 'tar around my neck, wind my Marshall amp up until the valves glow red hot, and terrify the neighbours with a few Hendrix, etc, riffs...

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...Fantastic...

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LOL...!
Paul.