Tony Visconti’s artistic legacy is largely defined by his professional working relationships with David Bowie and Marc Bolan. His chart breakthrough might have been with Bolan (Ride A White Swan, the first of 11 consecutive hits the Brooklyn-born Visconti delivered for T.Rex), but his most enduring collaboration was with Bowie (47 years off and on, from the singer’s eponymous debut to his swansong Blackstar). Yet there’s far more to Visconti than glam rock midwifery, as this neatly packaged four-CD/six-LP set amply demonstrates.