American gamelan music. Lou Harrison and William Colvig, who met in 1967 in San Francisco, built a set of tuned percussion instruments that they called "an American gamelan" in order to differentiate it from Indonesian ensembles. It was first used in Harrison's work "La Koro Sutro" in 1972. These are now referred to as "Old Granddad", and Harrison wrote some pieces that can only be played on this set, including "La Koro Sutro". Lou Harrison spent some time with a Javanese gamelan in 1976 (when Kyai Udan Mas, now at the University of California, Berkeley, was in residence at San Jose State
Gamelan Surakarta bonang panembung. A typical performance ensemble includes a female vocal soloist (pesinden) and male chorus (gerongan); in certain passages, the singers clap rhythmically (keplok). In Yogyakarta, there is a tendency to have more sarons of each register and it is more likely that the bonang panembung will be present. An archaic instrument, the celuring, a set of struck bells is found only on a few gamelan in the Yogyakarta Kraton and is played in place of the saron panerus. The Solonese style is often considered more refined (or "alus") than Yogyanese style. One specific difference is in saron peking playing;