New releases: John Martyn tribute featuring Robert Smith, The Clash on 10-inch vinyl

This week’s new releases include a tribute to the British guitarist/songwriter John Martyn featuring The Cure’s Robert Smith, a reissue on 10-inch vinyl of The Clash’s ‘Black Market Clash’ and a 3CD compilation of extended remixes by the likes of New Order and The Jesus and Mary Chain called 12″/80s Alternative.’