Let’s all get up and dance to a song that was a hit before your mother was born: Tonight PBS repeats last year’s intimate, charming little special in which Paul McCartney (with some help from Diana Krall) works through a repertoire of pop standards, including “Bye Bye Blackbird” – for him, a different kind of “Blackbird” song, but just as pleasant a listening experience. Oh, and if you’re wondering about the full title of his resultant album of standards, Kisses on the Bottom, it’s a quote from a line in “I’m Gonna Sit Right Down and Right Myself a Letter,” and the kisses on the bottom, in this case, refer to the “XOXO” signoff at the end of the page. Check local listings.