Something of a cult, this. In 1972?that year again?the Brits made a dreadful zombie movie wherein frog-worshipping biker boys commit suicide, then return, undead, to burn up motorways and terrorise old ladies like Beryl Reid outside supermarkets. Fog, satanism and skull helmets, on a budget of around nine quid. The soundtrack, however, by Kes man John Cameron, has changed hands for daft money since, and now appears on CD. It mixes wah-wah rock, choral arias and phased backwards drums for no better reason than that Cameron felt like it. "My recollection's blurred," he says. "Hell, it was the '70s." An eerie, uneasy ride.