What is Howard Wolowitz' ringtone in the April 7 2011 episode of TBBT?

In the April 7, 2011 episode of "The Big Bang Theory," titled "The Space Probe Disintegration," Howard Wolowitz's ringtone is the theme song from the "The Muppet Show." This choice reflects his quirky personality and love for pop culture. The ringtone is used humorously throughout the episode, adding to the show's comedic elements.