I'm a musicologist at a university. But I periodically teach in Austria at the Hochschule fur Musik Vienna.
I'm good at it because I'm good at everything I try.
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Seriously, this is just something I've excelled at, so I'm an expert. People hire me for it. It is a tricky thing to do well, and it requires patience and study. Every instrument is different.
But enough lessons from Dirk today. I'm boring you to death, and I'd rather be sexing you up.