Like me, my sisters Anne and Mary were born and raised in Baltimore (or, as the natives call it, "Bawlamer"). For fun, they sing a "Bawlamerese" version of "O Holy Night" which I post here as an example of just about everything Kathy tells us not to do pronunciation-wise when singing either chant or polyphony.
For comparison's sake, here's my very talented niece Abby (Mary's daughter) singing the same carol.
I sang this in my church choir when I was a soprano. No, that wasn't last year.