Simpsons Season 6, Episode 2: Lisa's Rival

A new student named Allison Taylor arrives at Springfield Elementary and proves to be more than a match for Lisa in both educational and musical feats. After Allison wins first chair saxophone in the school orchestra ahead of her, Lisa vows to defeat Allison at something: by winning the school diorama contest. Meanwhile, Homer steals 100 pounds of sugar from an overturned truck and decides to sell it to the town.