Sumer is icumen in

Historical accuracy is all important for us at Vox Holloway
Marj has written this pronunciation guide for Vox
Soomer is icoomen in lhoode Sing coocoo
Groheth sayd and bloheth mayd and springth the woode noo
Ow/e ( as in how) blaytith afteR Lahm lhohth afteR calve coo Boo-look
staiRtith boo-ke vaiRtith moorie sing coocoo (x3) wel singes thoo
coocoo nay swik thoo naiveR noo
(The capital R is a reminder to pronounce it!)