Jon Catler’s Evolution for electric guitar and orchestra is written in 13-limit Just Intonation. The piece begins simply, with one note evolving into two, then more, and soon an overtone series based on “A” emerges up to the 16th overtone, with other pitches being added as the piece evolves. The composer writes of his piece that “this Harmonic Symphony evolves the orchestra into a purely-tuned organism, capable of enveloping the energy of rock guitar.” Later in the piece, the voice enters in retrograde of the original theme, which signals the arrival of Man. The piece reaches its apex as 2 voices “battle for existence.” The composer credits the “sustenance” of the piece to his work with La Monte Young. The mode that evolves reveals the influence of Mr. Catler’s study of the music of Olivier Messiaen’s compositions.
Jon Catler is leader of The Microtones Band and directs Freenote Records.
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