While he didn’t lend his voice to the classic Simpsons song, Groening did say Michael Jackson was in the studio for the performance and supervised the guy he brought in to record the track.
Others had pointed to the classic song “Lisa It’s Your Birthday,” which, while good, was not quite the vocal quality of the typical Michael Jackson song.
As for how the rumors that it wasn’t actually Michael Jackson started, Groening told The Weekly those started popping up due to the King of Pop’s request not to be credited for his appearance.
Groening also added Jackson seemed to get a kick out of the performer and said Jackson giggled watching the impersonator recreating his voice for the segment, which you can check out, below.