It's time to play the music, as the infectious theme tune goes - The Muppet Show is back on the small screen, for the first time in four decades. Miss Piggy, her paramour Kermit the Frog, Gonzo, and Fozzie have reunited for the one-off show to mark its 50th birthday, after their beloved film outings such as Muppet Christmas Carol. Pop star Sabrina Carpenter, comedian Maya Rudolph and actor Seth Rogen - who is behind the 30-minute special - star in the show, released on Wednesday. Critics have