John sings Mustafa, evil Califf of Algiers, in Rossini's "L'Italiana in Algeria" on Teldec. There is also a DVD out of his "Cenerentola" (also Rossini), I am unsure of the label.
I often play the first act finale of the "Italian Girl" for customers since John's part is so prominent and so entertaining.
John performs during the season at the Met, and all over the world at summer opera festivals. He is scheduled for Verona next year (as Dr Bartolo) and at the Bastille in Paris in 2008.
Just call him the "primo buffo assoluto"!