...any fool...I used to think any fool can play the piano. After all, it's as simple as pressing the keys, right? My girlfriend proved me wrong.
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I used to think any fool can sing. I did not join the choir, claiming it to be a waste of my talents (in cello). I'm right, of course, but definitely not because singing is for noobs, or anything like that.
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I used to think any fool can play percussion. An encounter with the triangle proved me wrong.
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I used to think any fool can play guitar. After all, some guys learn the guitar for no better reason than to woo girls, and how good are they, really? It wasn't until I joined Volker Hartung's Swing Orchestra that I realized that it wasn't as simple as all that. (I syncopate very well by the way.)
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Some people think any fool can play the bass. Real bassists know that a fool with a bass does not a bassist make.
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Some people think any fool can compose. After all, it's as simple as sitting down and writing, right? We know who are the true fools in the end.
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Moral of the story - don't be a fool, else you won't have a job.