Key normalization
A few ideas:
Use music theory to minimize accidentals (as proposed
here)
Use music theory to maximize non-accidentals
Use music theory to maximize non-accidentals weighted by their prominence in the key (e.g., I weighted highest, IV and V weighted next-highest)
Use music theory to minimize accidentals weighted by their prominence in the key (e.g., bVII weighted lowest, bVI weighted higher)
Use music theory to minimize accidentals to get candidates and then use music theory to choose intelligently from candidates
Use music theory to maximize non-accidentals to get candidates and then use music theory to choose intelligently from candidates
Use neural network
Use HMM
Interesting ear training and other techniques and sites:
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Forum about this exact question
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Wikihow focuses on key signature, humming, and just practicing]
It's crazy how everyone essentially agrees there is a way to do it, but it always comes down to how it “feels”; is it “finished”? Where it “lands”. And other ambiguous phrases.
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