Under The Big Bright Yellow Sun (UTBBYS) is an instrumental post-rock band which was created since 13th of August, 2007 in Bandung, Indonesia. With a same taste of music, they agreed to make an instrumental post-rock band. Under The Big Bright Yellow Sun's music is a reflection of their daily life. Happy, sad, grateful, desperate, depressed, anger, that’s all reflected from their music arrangemen. UTBBYS don't want to be glued with the post-rock pattern that's identically with gloomy and monotones sound. UTBBYS do some experiment and sound exploration many times. Bow's applications sounds exploration with various guitar effects using ambient sound and also experimental bell become the character of UTBBYS.