The classic pop crooners of the ’40s and ’50s always had a way with festive tunes, so it makes perfect sense that their torch-carrier Harry Connick Jr. slips so naturally into the seasonal spirit. He can bring serious swing to classic Christmas celebrations like “Sleigh Ride” and “Let It Snow, Let It Snow, Let It Snow”, and he can even jazz up “Rudolph the Red-Nosed Reindeer”. But Connick can also come off like the coolest choirboy you’ve ever heard on the iconic Christmas carol “O Holy Night” and then turn around and lay down the funk on Donny Hathaway’s soulful slow-burner “This Christmas”.