The number of gangsa in a set varies with availability, and depends on the tradition of a particular ethnic group of the Luzon Cordillera: Kalinga, Ifugao, Bontoc, etc.
Notas para una cartografía de Filipinas, subtitled Prelude, Toccata, and Fugues for piano and gangsa, one player, is a work by the contemporary classical composer Jeffrey Ching (Chinese name in Pinyin: Zhuang Zŭxin 莊祖欣, 庄祖欣).