It starts at an airport with this one guy with sunglasses (he’s some kind of famous person), walks out into a car with a lot of people around him.
At the same time this other guy, he looks kind of trashy, walks behind him, he is the one singing. Later the famous guy stands in a backstage room yelling at this other guy and throwing a vase after. the trashy guy is still there singing.
Then at some point the famous guy notices the trashy guy and starts following him. He follows him up a hill, while his fans are running after him. They end up in a concert place where the trashy guy sings in a band and the famous guy looks at him. I think those two guys may be the same person.