The Oscar winner also talked about his love of Radiohead
Both musicians appeared on the line-up for the US festival
The couple went public on Instagram in July
The two stars have made three films together in the last four years
The Beatles' ‘Across the Universe’ and Sonic Youth's ‘Tom Violence’ are among those listed
Chapman fatally shot Lennon in New York in 1980
Featuring new interviews with McCartney himself
He will play the singer in four upcoming biopics of the Fab Four
It features in a new box set called ‘Power To The People’, which is set for release in October
The release will also include a new documentary with unseen footage of Paul McCartney, George Harrison and Ringo Starr coming together to work on the original 'The Anthology' in 1994