Changes in Key Signature with Addition of Sharps or Flats

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This Demonstration shows how key signature changes as the number of sharps and flats in the treble clef is changed. Each major key has a corresponding minor key that begins four half-steps below. The green and red highlighted keys on the piano represent the corresponding major and minor keys of the key signature, respectively.

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Toggle between sharp and flat and select the number added to the key signature to see how the key changes.

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Contributed by: Maxine Sy Chu (April 2019)
Open content licensed under CC BY-NC-SA


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This was a project for Advanced Topics in Mathematics II, 2018–2019, Torrey Pines High School, San Diego, CA.



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