Date corrected 11 -> 9 November 1967. Operadis (http://www.operadis-opera-discography.org.uk/CLBENORM.HTM) lists this cast -- Souliotis, Tatum, Cecchele, Roni under Cillario, 1967 live -- with the note "Recording of a concert performance given by the American Opera Society in the Carnegie Hall, New York (9 November 1967)". A cast sheet filed with the incoming copy of this rip (NORMA.doc) also reads "Carnegie Hall NY, 9 November 1967". The 11 November date came from a French cast sheet in rip-4806 ("New-York, 11 novembre 1967"), which also credits the Metropolitan Opera orchestra and chorus; that attribution looks doubtful for an American Opera Society concert but I have no positive source for the orchestra, so I have left those fields alone.

Migration: a zero year, month, day or OperaClass id meant the value was unknown, not that it was zero. Set to null.

Top billing correction: Norma is the title role and was unbilled, while Oroveso, the fourth part, was billed. Restoring Norma, Adalgisa, Pollione.

Top billing correction: Oroveso was billed over the unbilled title role. Paired with the edit on portrayal 72756.