Jack Black is hosting "Saturday Night Live" for the first time in nearly 20 years - and he kicked off tonight's episode with a song about his return as host. Black began his opening monologue by jokingly announcing that he was quitting the hosting gig.

Jack Black rejoiced in his return to Saturday Night Live after nearly twenty years away, singing about the occasion to the tune of Aerosmith’s “Back in the Saddle.”

"It's been 20 years since I've been on this stage," A Minecraft Movie star said before rocking Studio 8H with Aerosmith's "Back in the Saddle."