US anthem based on drinking song - To Anacreon in Heaven

The reason there are so many high and low notes close together is because that's the way drunk people sing.

"To Anacreon in Heaven" A.K.A. The Drinking Song (Lyric Video)

The anthem, as shown before films played in theaters on US military bases:

United States National Anthem : Shock and Awe

The late, great George Carlin said the US is the only country whose anthem mentions rockets and bombs.