Thanks, Joe. The writers of the web site were wise enough not to reproduce that attribution from "hearsay". (A Philadelphia-based family against hosts of Mozart scholars ...)

Besides, what does the man mean by "Exultate"? Perhaps the theme of the "Alleluia" from Mozart's motet "Exsultate, iubilate", forged into a very mediocre round by an anonymous composer? It was definitely not Mozart either! In contrast, "Alleluia" KV 553 is a highly sophisticated piece of music, difficult to sing, and less funny than Mozart's best-known genuine rounds.

At least "Mozart's Drinking Round" is attributed correctly in the book, though in Mozart's own original lyrics, it was a "Taunting Round". It was bowdlerized already in 19th century German prints.