"Sa Ugoy ng Duyan" (literally in Tagalog: "In the Rocking of the Cradle"; official English title: "The Sway of the Baby Hammock"[1]) is a Filipino lullaby.
Lucio San Pedro composed the music of "Ugoy ng Duyan"; it was derived from the fourth piece of his own Suite pastorale in the 1940s.
[3] San Pedro drew inspiration in composing the music of the song from the melody his mother, Soledad Diestro, hummed when he and his siblings' were put into sleep during their childhood.
While on a stopover in the Hawaiian city of Honolulu, he met Levi Celerio, who became San Pedro's lyricist for his composition and wrote the words of "Ugoy ng Duyan" during the rest of their trip.
The song was originally intended to be an artsong, and as a result some of its first performers were the baritone Aurelio Estanislao and soprano Evelyn Mandac.