Sumer is a comin in (Sumer Is Icumen In) is a song in old Wessex (eth instead of ing as in raineth rather than raining) plus other odd spelling.
Middle English Modern English
Svmer is icumen in Summer is a coming in
Lhude sing cuccu Loudly sing Cockoo
Groweþ sed Growing seed
and bloweþ med and blowing meed (meadow)
and springþ þe wde nu and springing the wood anew
Sing cuccu Sing cuckoo
Awe bleteþ after lomb Ewe Bleating after lamb
lhouþ after calue cu Lowing after Calf, cow
Bulluc sterteþ Bullock starting
bucke uerteþ Buck (Farting)
murie sing cuccu Merrily sing cuckoo
Cuccu cuccu Cuckoo Cuckoo
Wel singes þu cuccu Well sing the Cuckoo
ne swik þu nauer nu stop the never now
Chorus words for round or other part singing
Sing cuccu nu • Sing cuccu. Sing cuckoo now, Sing cuckoo
Sing cuccu • Sing cuccu nu Sing cuckoo, Sing cuckoo now
My singing is not mean’t to be perfect though I do try and colour the words with a little of middle English.
For more information on the song here is the Wikipedia page
Or contact me on my email.