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A comment on Show HN: Chord Progressions.

Re:Show HN: Chord Progressions by aczerepinski on Saturday November 18, 2017 @09:27AM (#15729051)
“There are 30 keys”

You could make the case that there are 12 keys, or some multiple of 12 keys, or near-infinite keys. But 30? Pretty random!

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Re:Show HN: Chord Progressions by peterburkimsher on Saturday November 18, 2017 @12:07PM (#15729765)
Are some of those keys duplicates of each other? Or missing?

I could be wrong - I just guessed that from another data source (some PDF song sheets that have the key listed on the top right).

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Re:Show HN: Chord Progressions by multi_tude on Saturday November 18, 2017 @12:33PM (#15729867)
I think the 30 keys comes from the rollout piano from his couch surfing bud.
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