Here is the manuscript (MS. Eng. Poet e.I; c. 1485-90) and the music for "Bring in Good Ale." Note that a Middle English carol, "nowelle, nowelle, nowelle" is set to the music, followed by the words to the drinking song. This sort of borrowing of received and familiar forms was a common practice in the Middle Ages, as it still is today. I cite 60s comedian Allan Sherman's plaint about summer camp, "Hello Muddah, Hello Fadduh (A Letter From Camp)" set to Amilcare Ponchielli's "Dance of the Hours" (remember the dancing hippopotami in Fantasia?) and The Toy's 60s hit, "A Lover's Concerto," set to a minuet from Bach's Notebook for Anna Magdalena Bach.