The British national anthem is traditionally sung in G major. The opening phrase (first two lines) in letter notation:
G - B♭ - D - G - A - B♭ G - B♭ - D - G - B♭ - C D - G - B♭ - G - A - B♭ G - B♭ - D - E♭ - G
Rhythm: 3/4 time; the first note (G) is a pickup. The anthem has multiple verses; the melody repeats for each.
Note: When the monarch is female, the lyrics change to "God Save the Queen," but the music remains identical.