'Babylon' review: Imagine 'Singin' in the Rain,' but rancid and cynical

Those who loved La La Land are about to get Whiplash from Damien Chazelle's latest. 

Where that winsome musical sang and danced (and monologued) about the hopes and wonders of Hollywood, Babylon assaults audiences with gross-out gags and tiresome debauchery, painting the movie-making industry as a hedonistic hellscape of...