Amanda Seyfried has revealed that her viral performance of Joni Mitchell's music stemmed from years of preparation for a biopic that never materialised. The actress learned Mitchell's iconic Blue album on multiple instruments, met the singer at her home

The project reunites Pitt and Ayer for the first time since 'Fury,' their 2014 World War II epic for Sony, and comes following Pitt's starring role in the Oscar-nominated 'F1.'