Travis Scott Fortnite Live Concert?

As some of you have probably noticed, Travis Scott is somehow 4 days on Fortnite and does a "live concert". Now I have a question… Does he really sing live or are his songs just played? Because I'm discussing with my buddy whether he really sang live. He says yes, I say no. If he didn't sing live, why is it called a live concert?

His songs are just played. It was the same at the other concert in Fortnite. It's called a live concert because it's supposed to be a live concert by him.

The songs are played.

The songs were recorded. You can't broadcast that into a game live