"Wally" is a Sesame Street opera presented by Phil Harmonic, who watches from the audience of the Nestropolitan Opera with his Uncle Donny. It is known world-wide as the "rhyming opera" because almost every word in it rhymes with the word "Wally. Wally, his collie Polly, and his dolly Molly, meet Holly at Follington Square. The two take the trolley, get married, and open a Mexican tamale stand.