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Octave Registers - All About Music Theory.com
Music Notation
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해당 음과 옥타브 차트 벡터가 있는 스톡 벡터(로열티 프리) 2096009635 | Shutterstock
Octaves of a grand piano keyboard with scientific and Helmholtz pitch notation. Middle C is colored
Music Notation
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Octave interval hi-res stock photography and images - Alamy
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