Well, technically it's not Johnny Cash, but Jimmy Fallon does a pretty good impression of The Man In Black.
Fallon and actor Ethan Hawke, who did his best Willie Nelson, performed "On The Road Again/Let's Just Stay Here," on The Tonight Show.
Until now, I had no clue what Fortnite was. It's the game all the kids are playing but I don't have kids...
Wait until the end and you'll get a pretty detailed explanation from Johnny about what Fortnite is and why he's "stayin' here."