Sun Kil Moon, Amanda Palmer and Lou Barlow also set to feature
Unheard version of 'From A Basement On The Hill' song appears on soundtrack to new film 'Heaven Adores You'
The mellow version is part of the soundtrack to Smith movie 'Heaven Adores You'
Actor/musician played a tribute to the late singer-songwriter in 2013
Film was funded by fans via Kickstarter
The film is the first full-length documentary to gain access to Smith's friends
The film will be shown around the world in May, including a UK screening in Derby
The song was discovered during the making of new documentary 'Heaven Adores You'