la monte young, composition 1960, #7
depending on how broad your understanding of the chord, there is also scelsi's quattro pezzi su una nota sola (sorry to the italian speakers), 4 "movements" each having a focal point of a single tone, with microtonal and timbral variations.
and perhaps 3rd movement (farben) of schoenberg op16, while the piece is not the same "notes" throughout the work, the entire movement is structured by a 5-note chord, with each note being changed by a semitone or whole tone in succession, kind of a "fluid" single chord throughout the work.
not the whole work, but the quintessential non-harmonic section of a larger work might be wagner's opening scoene to the rheingold. big fat Eb mother of all chords.
ah and this is a great one, "x for henry flynt" also by young. david tudor did a version for cymbal, i think, at the première. ensemble recherche did quite a good version as well.
La Monte Young's Composition 1960 No. 7 consists of two notes, B and F# at the bottom of the treble clef, written as semibreves with ties: this notation is accompanied by the instruction 'to be held for a long time'. Arabic Numeral (Any Integer) to H.F. (April 1960), popularly known as X for Henry Flynt, requires the performer to repeat a loud, heavy sound every one to two seconds as uniformly and as regularly as possible for a long period of time.
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