videos

We actually have the British to blame for the tune (bold + italics emphasis mine):

"The Anacreontic Song", also known by its incipit "To Anacreon in Heaven", was the official song of the Anacreontic Society, an 18th-century gentlemen's club of amateur musicians in London. Composed by John Stafford Smith, the tune was later used by several writers as a setting for their patriotic lyrics. These included two songs by Francis Scott Key, most famously his poem "Defence of Fort McHenry". The combination of Key's poem and Smith's composition became known as "The Star-Spangled Banner", which was adopted as the national anthem of the United States of America in 1931.

[...]

The Anacreontic Song served as the "constitutional song" of the Society. After the initial concert and meal, the Song would be sung in order to open the after-supper, more light-hearted part of proceedings. The verses, which are difficult to sing because of their wide range, would be sung by a solo singer, with the entire Society joining in the refrain. Although it is often described as a "drinking song", Lichtenwanger states that "To Anacreon in Heaven" "was not a barroom ballad, a drinking ditty to be chorused with glasses swung in rhythm", but "convivial, ... in a special and stately way".