[A Complete Unknown] is a brisk, tuneful and very entertaining two hours and 20 minutes of bog-standard Hollywood biopic... [Chalamet] is excellent, even if he gives the second-best performance in the movie... I enjoyed Chalamet’s [turn], but [Edward] Norton’s made me giddy, so perfectly does he capture Pete [Seeger’s] generosity, piousness and near-total incomprehension at what’s happening — his entire generation made passé, overnight.