A rota is a type of round, which in turn is a kind of partsong. To perform the round, one singer begins the song, and a second starts singing the beginning again just as the first got to the point marked with the red cross in the first figure below. The length between the start and the cross corresponds to the modern notion of a bar, and the main verse comprises six phrases spread over twelve such bars. In addition, there are two lines marked "Pes", two bars each, that are meant to be sung together repeatedly underneath the main verse. These instructions are included (in Latin) in the manuscript itself.
The celebration of summer in "Sumer Is Icumen In" is similar to that of spring in the French poetic genre known as the reverdie (lit. "re-greening"). However, there are grounds for doubting such a straightforward and naïve an interpretation. The language used lacks all of the conventional springtime-renewal words of a reverdie (such as "green", "new", "begin", or "wax") except for springþ, and elements of the text, especially the cuckoo and the farmyard noises, are susceptible of double meanings. "It is the wrong bird, the wrong season, and the wrong language for a reverdie, unless an ironic meaning is intended" (Roscow 1999, 188, 190, 193).
The translation of "bucke uerteþ" is uncertain. Some translate the former word as "buck-goat" and the latter as "turns" or "cavorts", but the current critical consensus is that the line is the stag or goat "farts" (Millett 2003b; Wulstan 2000, 8).
This piece was parodied as "Ancient Music" by the American poet Ezra Pound (Lustra, 1913–1915):
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.
The song is also parodied by P. D. Q. Bach as "Summer is a cumin seed" for the penultimate movement of his Grand Oratorio The Seasonings.
Vernon Duke gently parodied and paid homage to the round with his song "Summer is A-Comin' In," with the verse making reference to "a troubadour / Way back in 1226." Each refrain of the song begins with the phrase "Summer is icumen in / Lhude sing cucu." The song has been recorded by Charlotte Rae (twice) and Nat King Cole, among others.
The song is also referenced in "Carpe Diem," by The Fugs on their 1965 debut album, The Fugs First Album.
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Toguchi, Kōsaku. 1978. "'Sumer is icumen in' et la caccia: Autour du problème des relations entre le 'Summer canon' et la caccia arsnovistique du trecento". In La musica al tempo del Boccaccio e i suoi rapporti con la letteratura, edited by Agostino Ziino, 435–46. L'ars nova italiana del Trecento 4. Certaldo: Centro di Studi sull'Ars Nova Italiana del Trecento.