If you missed last night’s PBS American Masters documentary on Nat King Cole, don’t even think about catching a replay. Not only was the script a dumbed-down, once-over-lightly account of one of the most significant careers in the history of American popular music, but the show contained next to no uninterrupted footage of Cole in performance. In between the snippets was a numbing succession of talking-head interviews with such irrelevant celebrity interlopers as Whoopi Goldberg and Carlos Santana. Rarely have I endured so witless a piece of junk. Avoid it at all costs.