Sumer is i-cumin in

[conuly]

Sing, cuccu, nu. Sing, cuccu.
Sing, cuccu. Sing, cuccu, nu.

Sumer is i-cumin in—
Lhude sing, cuccu!
Groweth sed and bloweth med
And springth the wude nu.
Sing, cuccu!

Awe bleteth after lomb,
Lhouth after calve cu,
Bulluc sterteth, bucke verteth—
Murie sing, cuccu!
Cuccu, cuccu,
Wel singes thu, cuccu.
Ne swik thu naver nu!

https://www.poetryfoundation.org/poems/51000/sumer-is-i-cumin-in

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Translated into Modern English:

Summer has come in,
Loudly sing, Cuckoo!
The seed grows and the meadow blooms
And the wood springs anew,
Sing, Cuckoo!
The ewe bleats after the lamb
The cow lows after the calf.
The bullock stirs, the stag farts,
Merrily sing, Cuckoo!
Cuckoo, cuckoo, well you sing, cuckoo;
Don't ever you stop now,

Sing cuckoo now. Sing, Cuckoo.
Sing Cuckoo. Sing cuckoo now!

https://blogs.bl.uk/digitisedmanuscripts/2012/06/sumer-is-icumen-in.html