Under The Big Bright Yellow Sun (UTBBYS) is an instrumental post-rock band which was created since 13th of August, 2007 in Bandung, Indonesia. The journey started since Yadi (Komeng) met Iben in an art gallery of the famous university which is located at the eastern of Bandung. With a same taste of music, they agreed to make an instrumental post-rock band that inspired of famous post-rock band, such as Explosions In The Sky, This Will Destroy You, Sigur Ros, Mogwai, Mono, etc.