Via the nephew Right Mike:
From "Aufsteig und Fall der Stadt Mahagonny" (pronounced "MAH-hah-go-nee"
And the nephew sez he don't like musicals. Well, Mike, this was an Opera, though a very bizzarro one at that. (When the piece premiered in Leipzig at the Stadtisches Theater in 1930, a Nazi riot erupted. Also, our Deutsche side of the family comes from Leipzig, though Right Mike has further Germanic infusion than I,)