T. Rex's The Slider is the definitive soundtrack to the Marc Bolan mania that swept most corners of the globe circa 1972. It was boom-time for manufacturers of lipstick-sized phials of glitter. The music press had a field day, too, seizing the opportunity to debate the rabid tensions between playful pop and sensible rock. But to the many thousands who had succumbed to T. Rextasy, the first great teenage phenomenon of the '70s, it was, in the words of Morrissey “Many people’s first love affair.”