Gagaku is court music and is said to have been introduced by a musician from Shiragi or Silla (an ancient kingdom on the present day Korean Peninsula) who attended the funeral of Emperor Ingyou. During the Heian period (794-1185), foreign music from China and Korea was added to ancient Japanese music, greatly enriching the form and content of the music. Gagaku has the most systematic theory of all Japanese music, and has had a great influence on the music of later generations. Gagaku in Matsuai began when a court gagaku master, who was in hiding in the Sukui-no-Ura area of Matsugo Town, after the Shinpuren Rebellion in 1876, taught Gagaku to the people of Matsuai. The instruments used are the gaku taiko drum,(This is also called a tsuri-daiko. The drum is hung from a circular wooden frame), kakko taiko drum (a drum placed horizontally and beaten on both ends), shoko (gong), ryuteki (dragon flute), hosho,(an insrtrument made of many thin reeds) hichiriki (a double reeded instrument played vertically), shaku-byoushi (a wooden clapper-two pieces of wood beaten against each other), and koto.