They begin with opera, sharing solos in "La donna e mobile," and other operatic material is included--notably "Nessun dorma," which is one of Pavarotti's signature tunes, and "Ah! mes amis" from La Fille du Regiment, with its formidable series of high Cs. But a livelier agenda is established with "Let the Good Times Roll," and the program expands to include pop, blues, Broadway, spirituals, and even a touch of patriotism in "America the Beautiful." Cook has the biggest show-stopper: Cab Calloway's "Minnie the Moocher." --Joe McLellan