In traditional Japanese "gagaku", the imperial court music, a tone cluster performed on "shō" (a type of mouth organ) is generally employed as a harmonic matrix. Yoritsune Matsudaira, active from the late 1920s to the early 2000s, merged "gagaku"s harmonies and tonalities with avant-garde Western techniques. Much of his work is built on the "shō"s ten traditional cluster formations. Lou Harrison's "Pacifika Rondo", which mixes Eastern and Western instrumentation and styles, mirrors the "gagaku" approach—sustained organ clusters emulate the sound and function of the "shō". The "shō" also inspired Benjamin Britten in creating the instrumental texture of his 1964 dramatic church parable "Curlew River". Its sound pervades the characteristically sustained cluster chords played on a chamber organ . Traditional Korean court and aristocratic music employs passages of simultaneous ornamentation on multiple instruments, creating dissonant clusters; this technique is reflected in the work of twentieth-century Korean German composer Isang Yun.