in music, scale refers to a range of notes that are played in ascending or descending order. an octave is a unit of measurement used to describe the distance between two notes on a scale – for example, the note a is an octave above the note c. the key of a piece of music is the tonal center around which the melody and harmony are based – it’s usually represented by one of the first seven letters of the alphabet (a-g). pitch describes how high or low a note sounds.
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