I was at a local library and decided to crack open a book I’d ignored before called “Latin Pronunciation According to Roman Usage” edited by William D. Hall (I had ignored it because the title, to me, suggested classical Latin rather than church Latin) - it turns out it’s a small book originally published in the 30’s by the St. Gregory Guild to help church choirs pronounce Latin words correctly. All of the Choirs parts of the ordinary of mass are included with the Latin/Greek on one side and a phonetic spelling on the other, making it look like:
Kyrie Eleison--------------------KEE-ree-eh eh-LEH-ee-sawn
Gloria in excelsis Deo-------GLAW-ree-ah EEN eck-SHELL-sees DEH-aw
There’s also a section in back with the Requiem and benediction and Marian hymns. It seems like a wonderful book, but I was wondering if anyone else had encountered it and had any thoughts on it.