Michael Jackson was portrayed by his nephew, Jaafar, in "Michael." Mike Guastella/Ron Galella Collection/Getty Images; Lionsgate Actors often transform into real-life musicians for biopics.  Some actors go through physical transformations to play musicians. Jaafar Jackson trained for years to portray his uncle, Michael Jackson, in "Michael." Musical legends have been portrayed on the big screen for decades, in biopics that range from transformative to highly mediocre. Actors hoping to accur...