Editing Octatonic scale (section)

===Alpha chord===
<!--[[Alpha chord]] and [[Golden section chord]] redirect directly here-->
{{Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' {
  \clef treble \key c \major
  <cis e g bes c es fis a>1
} }
</score>

<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' {
  \clef treble \key c \major
  \once \override NoteHead.color = #red des8 \once \override NoteHead.color = #blue es \once \override NoteHead.color = #red e! \once \override NoteHead.color = #blue fis \once \override NoteHead.color = #red g \once \override NoteHead.color = #blue a \once \override NoteHead.color = #red bes \once \override NoteHead.color = #blue c
} }
</score>|width=300|caption=Two diminished seventh chords in the octatonic scale (one red, one blue) may be rearranged as the alpha chord}}
The alpha chord (α chord) collection is, "a vertically organized statement of the octatonic scale as two [[diminished seventh chord]]s", such as: C{{music|sharp}}–E–G–B{{music|flat}}–C–E{{music|flat}}–F{{music|sharp}}–A.{{sfn|Wilson|1992|loc=7}}

One of the most important subsets of the alpha collection, the alpha chord ([[Forte number]]: 4-17, [[pitch class]] [[prime form (music)|prime form]] (0347)), such as E–G–C–E{{music|flat}}; using the theorist [[Ernő Lendvai]]'s terminology,{{sfn|Lendvai|1971}} the C alpha chord may be considered a [[mistuning|mistuned]] [[major chord]] or major/minor in first inversion (in this case, C major/minor).{{sfn|Wilson|1992|loc=9}}{{clarify|date=May 2020|reason=How is it mistuned?}} The number of semitones in the [[interval array]] of the alpha chord corresponds to the [[Fibonacci sequence]].{{sfn|Slayton|2010|loc=15}}{{Explain|date=May 2020|reason=How does the array correspond to what part of the sequence?}}