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Amazon.com: Piano and Keyboard Note Chart, Use Behind Keys Practice Keyboard & Note Chart Useful Ideal Visual Tool for Beginners Any Medium to Full Size Piano Keyboard Cover Four Octaves : Musical
![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://l450v.alamy.com/450v/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)
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
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