What is the difference between scale, octave, key, pitch in music
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Pitch is basicaly the frequency of a note.
An octave is an interval whose higher note has a sound-wave frequency of vibration (pitch) twice that of its lower note.
A scale is a graduated sequence of notes, tones, or intervals dividing what is called an octave.
A key is the main group of pitches, or notes, that form the harmonic foundation of a piece of music.
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