Sumer is icumen in

 Voicing: SATBBB, or 6 equal voices

Sumer is icumen in, Sumer=summer; icumen=coming
Lhude sing cuccu; lhude=loud, cuccu=cuckoo
Groweth sed and bloweth med sed=seed, med=meadow
And springeth the wude nu. springeth=revives, wude=woods, nu=now
Sing cuccu!
Awe bleateth after lomb, awe=ewe, lomb=lamb
Lhouth after calve cu; lhouth=lows (moos), calve=calf, cu=cow
Bullock sterteth, bucke verteth; sterteth=jumps, bucke=?buck, verteth=passes gas
Murie sing cuccu. murie=merry
Cuccu, cuccu,
Wel singes thu, cuccu, wel=well, thu=thee (you)
Ne swik thu naver nu. swik=be silent, naver=never
Sing cuccu nu! Sing cuccu!
Sing cuccu! Sing cuccu nu!

-- Anonymous (c.1250-1350)

("Sumer is icumen in" is the lyric of a song of considerable distinction:   it is the oldest known canon or round; the oldest known six-part composition; and one of the oldest known pieces in the major mode.)