"It's Five O'Clock Somewhere" is a song performed by Alan Jackson and Jimmy Buffett, and written by Jim "Moose" Brown and Don Rollins. It was released in June 2003 as the lead single from Jackson's 2003 compilation album Greatest Hits Volume II. It spent eight non-consecutive weeks at Number One on the Billboard Hot Country Songs chart in summer of 2003. In addition, the song hit number 17 on the US Hot 100, making it the biggest pop hit for Jackson and the first top forty hit for Buffett since the 1970s. On November 5, 2003, it also won the Country Music Association (CMA) Award for Vocal Event of the Year. The song became the #3 country song of the decade on Billboard's Hot Country Songs Chart.