Oh, I bet that was Jimmy Fallon's idea. I don't watch the show myself, but he's done several bits where he impersonates various classic rock stars singing current pop songs or TV theme songs.
Here's The Doors singing "Reading Rainbow"
Here's Bob Dylan singing the theme to "Charles in Charge"
Here he does Neil Young singing Willow Smith's "Whip My Hair
" featuring the actual Bruce Springsteen made up as Young Bruce Springsteen.