'Reissue' for classic Clash album

The Clash recorded London Calling in 1979

UK rock band The Clash's landmark album London Calling is to be reissued with newly-discovered demo tracks and unseen live DVD footage, it is reported.

A 25th anniversary edition of the 1979 album will be released in September, US music trade paper Billboard said.

It will include a CD of demos dubbed The Vanilla Tapes, found in a storage facility belonging to Clash guitarist Mick Jones, Sony Music said.

A film featuring band interviews and studio footage will also be included.

A 45-minute documentary created by band associate Don Letts also contains previously unreleased live performances, and a conversation with former manager Kosmo Vinyl.

The demos were found in storage belonging to Mick Jones

The demos include songs that did not make the final cut for London Calling, although a tracklisting has not been finalised.

There will also be photos by Pennie Smith, who took the album's iconic cover shot of bass player Paul Simonon smashing his guitar during a show in New York.

London Calling, the band's third album, is widely regarded as one of the finest of the punk era.

It regularly tops fans' and critics' lists and recently took third place in The Observer's 100 best British albums of all time, beating The Beatles, Rolling Stones, David Bowie and Oasis.

Rolling Stone magazine called it the greatest album of the 1980s - the decade in which it was released in the US.

This month The Clash were given Mojo magazine's inspiration award. Singer Joe Strummer died in 2002, aged 50.