Too marvelous The centennial of Johnny Mercer's birth has triggered a local radio party with a mighty impressive guest list. "Tribute to Johnny Mercer" (6 a.m., KFAI, 90.3 FM and 106.7 FM) is a six-hour tribute that features some of the artist's most beloved songs, including "That Old Black Magic" and "One for My Baby," and testimonials from Tony Bennett, Nancy Wilson, Barry Manilow and Andy Williams. The special continues at the same time next Wednesday.

Hercules! Hercules! The biggest diva at the season finale of "America's Next Top Model" (7 p.m., WUCW, Ch. 23) won't be onstage. He'll be in the audience. Eddie Murphy will be on hand -- and not because he thinks the show is a spinoff of "Dreamgirls." He's there to support his daughter, Bria Murphy, who will be appearing on the runway along with the finalists.

Janet at home Janet Jackson opens her Malibu home to the ABC "Good Morning America" cohost for a wide-ranging conversation that includes Jackson's thoughts on her family and the death of her brother, Michael, on "In the Spotlight With Robin Roberts: Janet Jackson" (9 p.m., KSTP, Ch. 5).

NEAL JUSTIN/ANN M. WILHELMY