“There are 30 keys” You could make the case that there are 12 keys, or some mult... | Hacker News

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aczerepinski on Nov 18, 2017 | parent | context | favorite | on: Show HN: Chord Progressions

“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!

peterburkimsher on Nov 18, 2017 | [–]

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).

multi_tude on Nov 18, 2017 | [–]

I think the 30 keys comes from the rollout piano from his couch surfing bud.

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