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 Piny''in: Zhuang Zŭxin 莊祖欣, 庄祖欣).
The traditional harmonies of the Japanese mouth-organ (shō) are quoted, and gagaku drums of different sizes evoked through various percussive effects (palm and fingernail taps and tremolos) on the wooden casing of the piano.
The two geographical areas unite in a double fugue for the concluding allegro tempo primo, embracing the remaining region of Luzon (the northernmost island group) only upon the entry of the gangsa, the flat lap-gong of the Kalingga and Tinggian tribes.
After a seventh interruption (which gives the pianist the opportunity to position the gangsa over the piano's lowest strings), a majestic restatement of the Visayan lullaby theme gradually subsides, bringing the whole work to a quiet close.
Jeffrey Ching hatte für seine Notas ein kalligrafisches Notenbild zu bieten, dessen ornamentale Feinheit sich im Klang wider-spiegelte.