Sparking a change in the life of Yuenyong (Aed) Opakul, was the responsibility to be the producer for the first album of the group Hammer in 1979. It was this album that caused Hammer to be known in the world of music. And in 1980, Aed composed the song “Teuk Kwaai Tui” (“Wild Buffalo”) for Hammer to record for their album “Bpak Dtai Baan Rao” (“Our Southern Home”). That album caused Hammer to be extremely famous. So afterwards, Yeunyong Opakul worked with Hammer to come out with an album of songs under the name “Khanchanmueang” with a folk/look thung musical style and participated in composing songs for a movie starring the singer Phonom Napon in 1981.