"Fire" (also known as "The Elements – Part 1" and "Mrs. O'Leary's Cow") is an instrumental by American musician Brian Wilson that he originally composed for the Beach Boys' never-finished album Smile. Named after Catherine O'Leary and the Great Chicago Fire, the track was originally conceptualized as part of "The Elements", a four-part movement based on the four classical elements: Air, Fire, Earth, and Water. Wilson's friends, family, and colleagues later referred to its recording as heralding his period of psychosis and the unraveling of the Smile project.