William Pierce Butler (born October 6, 1982) is an American multi-instrumentalist and composer who is best known as a former member of the indie rock band Arcade Fire. He plays synthesizer, bass, guitar and percussion. He is known for his spontaneity and antics during performances. He is the younger brother of Arcade Fire frontman Win Butler. In 2014, Will Butler was nominated for the Academy Award for Best Original Score for his work on the original score of the 2013 film Her.