Help me with this Family Guy reference:The Father, The Son and the Holy Fonz

In the episode when Peter Griffin created the church for the fonz

It was one of these cut-away sequences, after he was putting up a sign on a barn, a joke was made about an “Aaron Neble Megaphone”. What is the reference about?

Aaron Neville, a singer famous for having such a ridiculous vibrato that he wavers in and out of a note. For songs you may recognize, go to amazon and listen to “Don’t Know Much” or “Everybody Plays the Fool.” Try any other song, and you’ll still hear the unmistakably annoying voice.