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This is something that is next to impossible to do in any sensible manner, unless (1) one focuses only on a single melody (or part) of a work that (presumably) is harmonized or polyphonic, (2) one transposes everything to a common key, which itself becomes sticky when both major and minor modes are sampled, (3) one discovers that most eras of music require the addition of accidentals (sharps & flats) to the diatonic scale, (4) one discovers that there are changes of key signature and modulations to new keys within a work, (5) one realizes that harmony is an essential ingredient of music written from the Renaissance onward, at least until one encounters the atonalism and serialism of modern times (which was actually preceded by polytonality already in the 19th century).... the most frequent notes or tones used in a particular period or style of music, ...
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