In the film 'Walk the Line' from 2005, Joaquin Phoenix plays a famous musician. Who?

Explanation

'Walk the Line' is based on Johnny Cash's life. Cash is portrayed by Joaquin Phoenix whilst Reese Witherspoon plays June Carter, Cash's wife. Both actors sang all the songs themselves in the film, which was released only 2 years after Cash's death in 2003. In fact, Cash was involved himself in developing the film.