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In music, an octave (: eighth) or perfect octave (sometimes called the '''diapason''') is an interval between two notes, one having twice the frequency of vibration of the other. For instance, the interval between C₄ and C₅ (in scientific pitch notation) is an octave.
:{\override Score.TimeSignature
#'stencil = ##f \relative c' { \time 4/4 \set Score.tempoHideNote = ##t \tempo 1 = 20 1 }}

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