An unheard radio show featuring David Bowie in his 1970s heyday is to be broadcast for the first time. The recording, featuring the legendary musician performing five tracks from his 1973 covers album Pin Ups, was discovered by researcher Nigel Reeve. The 15-minute tape was recorded in 1973 to promote the album but was not broadcast at the time. Reeve tells the BBC, "It was in an old tape vault on quarter-inch tape with simply the words 'Radio Show' written on it. This is such a rare find. No one knew of its existence, apart from David and (producer) Ken (Scott). To play it for the first time was quite simply a jaw-dropping moment." The recording will be broadcast on the BBC's Radio 6 Music on Wednesday (23Oct13).