P. 11 of George Colman's "Songs, duetts, trios, &c. in the new comedy of Two to one. As performed at the Theatre-Royal, in the Hay-Market," 4th edition. (London, 1785), has an original song to the tune of "Peggy of Derby-O."

The melody is unfortunately not printed and the song (in the same meter as the one we're talking about) isn't very intresting. Nor does it mention anything like "Fennario."