To become Bob Dylan in “A Complete Unknown,” Timothée Chalamet spent years practicing guitar and was even outfitted with cheek plumpers and nostril expanders.

The new biopic stars Timothée Chalamet as the musical genius, but it’s less about him than about his effect on others.

Dylan, a Nobel Prize winning poet, songwriter and performer, also ranks among the most enigmatic. Mangold chronicles Dylan’s Greenwich Village roots, performing in basement coffee houses, recording, forming a romantic and professional partnership with folk singer activist Joan Baez.