48 actors who completely transformed themselves into real-life music legends

Director James Mangold and Timothée Chalamet behind the scenes as Bob Dylan in "A Complete Unknown."

Macall Polay/Searchlight Pictures

• Actors often transform into real-life musicians for biopics. 
• Some actors go through physical transformations to play musicians.
• Many, like Timothée Chalamet and Angelina Jolie, employ vocal coaches to nail their performances.  

Musical legends have been brought to the big screen for decades, in biopics that range from transformative to highly mediocre.