 Tito Puente and his Latin jazz ensemble appear in the episode and sing the song " Señor Burns " . Oakley and Weinstein were unfamiliar with Puente and wrote him into the episode because Groening is a fan . They figured he would sing the song , but later discovered that Puente was a drummer , not a singer . The lyrics were sung by one of Puente 's band members . His band would also play their version of The Simpsons ' theme over the end credits . 
