Every glitter magpie in London — gay, straight, tarted up, blissed out — was at the Rainbow that night. And so, apparently, was Lou Reed. Not known for doling out praise, he described Bowie’s Rainbow show in the press as ‘the greatest thing I have ever seen’. Reed was spending that summer in London, working with Bowie, his guitarist Mick Ronson and Ken Scott, the record producer and engineer who helped Bowie craft his sound on Hunky Dory, Ziggy and, later, Aladdin Sane. Together, they were recording Reed’s defining album, Transformer, at Trident Studios in St Anne’s Court, a tiny Soho back alley (a Ziggy plaque now marks the spot.) The German musician and artist Klaus Voormann, one of the most beautiful blokes in rock, played bass guitar on four of the Trident tracks. ‘Lou and David got on like a world on fire,’ he recalls. ‘Those were two that found each other. Their discussions were witty, funny and cheeky. It was very camp. Lou had his fingernails painted black and played fantastic rhythm guitar.’