Good Friday edition of the program all about TV. Our very special guest, live from London: Dave Clark, iconic music legend, originator of The Dave Clark Five, and overseer of The Dave Clark Five--Glad All Over, a Great Performances episode replayed tonight on PBS. Also: a Daytime Emmy Awards nominations report, and tributes to Garry Shandling, The Waltons/Falcon Crest creator-producer Earl Hamner and Joe Garagiola.