Lin-Manuel Miranda gives us an unashamed sugar rush of showbiz rapture and showbiz solemnity in this heartfelt tribute to Broadway talent Jonathan Larson, played here by Andrew Garfield. Larson was the composer who created the smash-hit 90s show Rent but died at 35 of an aortic failure, just before opening night, an almost unbearable metaphor for the backstage heartbreak of musical theatre...