Runtime: 1h 27m
imdb synopsis: When his new album fails to sell records, pop and rap superstar conner4real (Andy Samberg) goes into a major tailspin and watches his celebrity high life begin to collapse. He’ll try anything to bounce back, anything except reuniting with his old rap group The Style Boyz.
Streaming availability: https://www.justwatch.com/us/movie/popstar-never-stop-never-stopping
I would say Walk Hard: The Dewey Cox Story is also in the same league.