Lennon has contributed to several episodes of "The Simpsons": in season 3's "Stark Raving Dad", although Michael Jackson (credited as "John Jay Smith") performed the speaking part of Leon Kompowsky, a character who pretended he was Michael Jackson, Lennon sang the songs due to contractual obligations from Jackson with his record company at the time. Most notably he sang the song "Happy Birthday Lisa," written by Jackson within the episode. He also provides Jackson's singing voice in "". Lennon returned as Kompowsky to sing the extra verses Bart wrote for his sister in season 29's "Mr. Lisa's Opus".