The Elektra chord is a "complexly dissonant signature-chord" and motivic elaboration used by composer Richard Strauss to represent the title character of his opera Elektra that is a "bitonal synthesis of E major and C-sharp major" and may be regarded as a polychord related to conventional chords with added thirds, in this case an eleventh chord. The chord is also found in Claude Debussy's Feuilles mortes, where it may be analyzed as an appoggiatura to a minor ninth chord, and Franz Schreker's Der ferne Klang, and Alexander Scriabin's Sixth Piano Sonata.