Editing Octave (section)

=== Octave of a pitch ===
Octaves are identified with various naming systems. Among the most common are the [[Scientific pitch notation|scientific]], [[Helmholtz pitch notation|Helmholtz]], organ pipe, and MIDI note systems. In scientific pitch notation, a specific octave is indicated by a numerical subscript number after note name. In this notation, [[middle C]] is C<sub>4</sub>, because of the note's position as the fourth C key on a standard 88-key piano keyboard, while the C an octave higher is C<sub>5</sub>.

[[File:Piano Frequencies.svg|frame|alt=Piano Keyboard|An 88-key piano, with the octaves numbered and [[C (musical note)#Middle C|Middle C]] (turquoise) and [[A440 (pitch standard)|A440]] (yellow) highlighted]]

:{| style="border-spacing: 2px; border: 1px solid darkgray;"
! style="text-align: right" colspan="13" | <score lang="lilypond"> {
\override Score.SpacingSpanner.strict-note-spacing = ##t
\set Score.proportionalNotationDuration = #(ly:make-moment 1/32)
\override Score.TimeSignature #'stencil = ##f
\relative c,,,, {
   \clef bass 
   \time 11/1
   \key c \major
   c1 c' c' c' c'
   \clef treble
   c' c' c' c' c' c'
} }
</score>
|-
! style="text-align: right" | Scientific
| style="text-align: center; width: 67px;" | C<sub>−1</sub>
| style="text-align: center; width: 67px;" | C<sub>0</sub>
| style="text-align: center; width: 67px;" | C<sub>1</sub>
| style="text-align: center; width: 52px;" | C<sub>2</sub>
| style="text-align: center; width: 52px;" | C<sub>3</sub>
| style="text-align: center; width: 55px;" | C<sub>4</sub>
| style="text-align: center; width: 55px;" | C<sub>5</sub>
| style="text-align: center; width: 55px;" | C<sub>6</sub>
| style="text-align: center; width: 67px;" | C<sub>7</sub>
| style="text-align: center; width: 67px;" | C<sub>8</sub>
| style="text-align: center; width: 67px;" | C<sub>9</sub>
| style="text-align: center; width: 25px;" | 
|-
! style="text-align: right" | Helmholtz
| style="text-align: center" | C,,,
| style="text-align: center" | C,,
| style="text-align: center" | C,
| style="text-align: center" | C
| style="text-align: center" | c
| style="text-align: center" | c'
| style="text-align: center" | c<nowiki>''</nowiki>
| style="text-align: center" | c<nowiki>'''</nowiki>
| style="text-align: center" | c<nowiki>''''</nowiki>
| style="text-align: center" | c<nowiki>'''''</nowiki>
| style="text-align: center" | c<nowiki>''''''</nowiki>
|
|-
! style="text-align: right" | Organ
| style="text-align: center" | 64 foot
| style="text-align: center" | 32 foot
| style="text-align: center" | 16 foot
| style="text-align: center" | 8 foot
| style="text-align: center" | 4 foot
| style="text-align: center" | 2 foot
| style="text-align: center" | 1 foot
| style="text-align: center" | 3 line
| style="text-align: center" | 4 line
| style="text-align: center" | 5 line
| style="text-align: center" | 6 line
|
|-
! style="text-align: right" | Name
| style="text-align: center" | <small>Dbl contra</small>
| style="text-align: center" | <small>Sub contra</small>
| style="text-align: center" | Contra
| style="text-align: center" | Great
| style="text-align: center" | Small
| style="text-align: center" | 1 line
| style="text-align: center" | 2 line
| style="text-align: center" | 3 line
| style="text-align: center" | 4 line
| style="text-align: center" | 5 line
| style="text-align: center" | 6 line
|
|-
! style="text-align: right" | MIDI note
| style="text-align: center" | 0
| style="text-align: center" | 12
| style="text-align: center" | 24
| style="text-align: center" | 36
| style="text-align: center" | 48
| style="text-align: center" | 60
| style="text-align: center" | 72
| style="text-align: center" | 84
| style="text-align: center" | 96
| style="text-align: center" | 108
| style="text-align: center" | 120
|
|}