Arthur's favourite cereal is holding a jingle contest and the winner's song will be played on T.V.! While D.W. gets to eating all the cereal she can, Arthur tries to come up with the perfect words and melody - only, he's stumped! He and Buster start a band, but it falls flat. Arthur can't get inspired. Then he overhears the perfect little tune from somewhere unexpected. But can Arthur submit the jingle as his own?