Martha Teichner on the Whimbrels; Ben Mankiewitz interviews comic Cedric the Entertainer ("The Neighborhood"); Rita Braver on sketches by Cezanne on exhibit at New York's Museum of Modern Art; writer David Chase; the reopening of "Wicked" on Broadway; Ground Zero, 20 years after 9/11; Wilma Melville; TV host/author Chris Wallace ("Fox News Sunday", book, "Countdown Bin Laden"); Dan Barry;