Staggeringly hollow and a horrific blot on the CVs of Curtis and Boyle. It's basically an ad for Latitude Festival, Ed Sheeran, Suffolk and of course The Beatles (as if they needed it). Sheeran - a terrible actor - calling himself Salieri to Jack's Mozart gives you a flavour of how bad this is.
(The brilliant Kate McKinnon as Jack's vulture of an agent is the only good thing in it.)