Editing Octatonic scale (section)

===Petrushka chord===
{{Image frame|content=<score sound="1" override_midi="Petrushka chord Second Tableau.mid">
    \new PianoStaff <<
         \new Staff = "up" \relative c'' {
            \time 3/4
            s2.
          }
        \new Staff = "down" \relative c' {
            \time 3/4
            \voiceOne
            \repeat tremolo 12 {
                  {
                    \change Staff = "up"
                    \voiceTwo
                    <e g c>32
                  }
                {
                    \change Staff = "down"
                    \voiceOne
                    <cis fis ais>32
                }
            }
          }
    >>
</score>|width=300|caption=The [[Petrushka chord]] in the piano during the second tableau of [[Stravinsky]]'s ballet ''[[Petrushka (ballet)|Petrushka]]''{{sfn|Taruskin|1987|loc=269}}}}
The [[Petrushka chord]] is a recurring [[Polytonality|polytonal]] device used in [[Igor Stravinsky]]'s ballet ''[[Petrushka (ballet)|Petrushka]]'' and in later music. In the Petrushka chord, two [[Major chord|major triads]], C major and F{{music|sharp}} major – a [[tritone]] apart – clash, "horribly with each other", when sounded together and create a [[Consonance and dissonance|dissonant]] [[Chord (music)|chord]].{{sfn|Pogue|1997|loc=80}} The six-note chord is contained within an octatonic scale.