"A lot of English traditional music is guesswork anyway, so it's very difficult for people to be vehemently opposed to experimenting with it."

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But is all this true?" said Brutha. Didactylos shrugged. "Could be. Could be. We are here and it is now. The way I see it is, after that, everything tends towards guesswork." "You mean you don't KNOW it's true?" said Brutha. "I THINK it might be," said Didactylos. "I could be wrong. Not being certain is what being a philosopher is all about.

— Terry Pratchett