Media playback is unsupported on your device

Martin Hannett documentary celebrates Manchester sound pioneer

11 April 2014 Last updated at 19:40 BST

A new film documentary celebrates the work of one of the men behind the bands who created the Manchester sound in the 1970s and 80s.

Martin Hannett was a producer at Factory Records, and worked with bands including Joy Division, the Stone Rose and the Happy Mondays.

He died from a heart attack in 1991.

Filmmaker Chris Hewitt carried out more than 150 hours of interviews with musicians and fans to make the film.