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No, that is true. There's no right or wrong in music theory - so I start by making it up and then when I write down the piece I have to find a key and then I have to analyse my own thoughts which is the best way I can come up with to learn about the mechanics behind it all. This one puzzles me, but it probably wont puzzle more knowledgable people :)

I once met a composer who told me 'I just take my pencil for a walk across the page'!

:) yes. I just sit at the piano and tries all sort of things, and then I write it down afterwards as best I can.