I did not know this.
The US national anthem ‘The Star-Spangled Banner’ is set to the tune of the English song ‘To Anacreon in Heaven’ which was the ‘constitutional song’ of the Anacreontic Society, a gentlemen’s music club in London.
lyrics:
http://www.miketodd.net/encyc/anacreontext.htm
sheet music:
http://www.bcpl.net/~etowner/anacreon.html