For years I knew this as a bit of music-history xeroxlore. Only this year did I learn that it's music-history xeroxlore by Ezra Pound. Who knew?
Winter is icumen in,
Lhude sing Goddamm,
Raineth drop and staineth slop,
And how the wind doth ramm!
Skiddeth bus and sloppeth us,
An ague hath my ham.
Freezeth river, turneth liver,
Damm you; Sing: Goddamm.
Goddamm, Goddamm, 'tis why I am, Goddamm,
So 'gainst the winter's balm.
Sing goddamm, damm, sing goddamm,
Sing goddamm, sing goddamm, DAMM.