The United States Navy Band Sea Chanters line up with their backs to the crowd at the U.S. Navy Memorial in 2014 and are introduced to the crowd as "The Jersey Boys." Then, the music begins, and the men break out singing "Sherry."
Although most people think of the military as being very rigid, that idea is disproved as you watch these five men jive to the 1960s music. The singers progress through a medley of songs from The Four Seasons: "Big Girls Don't Cry," "Walk Like a Man," "Rag Doll," "Let's Hang On," and "December, 1963 (Oh, What a Night)." They engage the crowd when one of the singers brings up a master chief to join him for "Rag Doll."

The Sea Chanters were formed in 1956 and are the official chorus for the Navy. According to the Navy, as a part of the band, the Chanters "inspire patriotism, elevate esprit de corps, enhance Navy awareness and public relations, ...  and project a positive image at home and abroad." They sing everything from opera to choral pieces to Broadway songs to contemporary music. 

The performance below was posted by the Navy on Aug. 3, 2015, and has had over 700,000 hits since then. According to the Navy, "Throughout their history, the Sea Chanters have remained true to the Navy’s watchwords of pride and professionalism, and they continue to flourish as a vibrant ensemble."