Octaves

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 } }

musical interval spanning fifteen staff positions and twenty-four semitones

musical interval of 11 semitones spanning eight staff positions