Rewinding the Country Charts: Alan Jackson and Jimmy Buffett 'Clock-ed' in at No. 1 in 2003

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Jimmy Buffett and Alan Jackson perform the song "It's 5 O'Clock Somewhere" at the 37th Annual Country Music Awards on Nov. 5, 2003.  

Their modern-classic party anthem spent eight weeks atop Hot Country Songs.

On Aug. 9, 2003, Alan Jackson and Jimmy Buffett's "It's Five O' Clock Somewhere" ascended 2-1 on Billboard's Hot Country Songs chart, reigning for eight weeks.

Penned by Jim "Moose" Brown and Don Rollins, "Somewhere" became the 21st, and longest-ruling, of Jackson's 26 leaders.

Buffett, who first reached the chart in 1973 (after working for Billboard as a Nashville correspondent in the late '60s/early '70s), earned his first of two No. 1s with the song; he led again as featured on Zac Brown Band's "Knee Deep" in 2011.

An infectious ode to celebrating summer at all hours, "Somewhere" also hit No. 17 on the all-genre Billboard Hot 100, marking Jackson's best showing. It's the second-highest peak for Buffett, after his signature song, "Margaritaville," which reached No. 8 in 1977.

On June 14, Jackson, 59 and currently on tour, was inducted into the Songwriters Hall of Fame. He was ushered into the Country Music Hall of Fame by Loretta Lynn in 2017.

At 71, Buffett remains one of the biggest drawing touring artists. On the 15th anniversary of "Somewhere" hitting No. 1, he'll play Boston's Fenway Park with his Coral Reefer Band.