text: "You're a Grand Old Flag" is an American patriotic march. The song, a spirited march written by George M. Cohan, is a tribute to the U.S. flag. In addition to obvious references to the flag, it incorporates snippets of other popular songs, including one of his own. Cohan wrote it in 1906 for his stage musical George Washington, Jr.
  History
  The song was first publicly performed on February 6, the play's opening night, at Herald Square Theater in New York City. "You're a Grand Old Flag" quickly became the first song from a musical to sell over a million copies of sheet music. The title and first lyric comes from someone Cohan once met; the Library of Congress website notes. "You're a Grand Old Flag" would go on to become one of the most popular U.S. marching-band pieces of all time.