Listening to "Muppets Tonight" while at work, and the opening bit where Kermit announces the guest star, (In this case it was the Whoopi Goldberg episode) I heard a faint phrase from the original Muppet Show theme...stunned, I backed it up, and listened to it again, it was a muted trumpet and brass section playing "It's time to get things started..." really faint, and jazzed up a bit, right as Kermit gets run over by the crowd, then the main theme starts.