Enjoy this new recording of a harmonization of the Ambrosian Gloria in excelsis, composed by our own Dr Peter Kwasniewski.
The Ambrosian Gloria may be found in the Liber Usualis, and used ad libitum; even though Ambrosian chant is perceptibly very different from Gregorian chant, I would say it fits well with most Mass settings. Here is a very nice recording of the original, with images of the notation below.
