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Portion of the music keyboard. Middle C on the piano is C4 and A4 is... | Download Scientific Diagram
![Octaves of a grand piano keyboard with scientific and Helmholtz pitch notation. Middle C is colored in gray. 88 keys and seven full octaves Stock Photo - Alamy Octaves of a grand piano keyboard with scientific and Helmholtz pitch notation. Middle C is colored in gray. 88 keys and seven full octaves Stock Photo - Alamy](https://c8.alamy.com/comp/W4W28D/octaves-of-a-grand-piano-keyboard-with-scientific-and-helmholtz-pitch-notation-middle-c-is-colored-in-gray-88-keys-and-seven-full-octaves-W4W28D.jpg)