BBC Radio 4's Front Row on Monday evening at 7:15pm takes a look at unreleased music. Presenter John Wilson talks to musicians including Kate Bush, Brian Wilson of The Beach Boys, Nick Mason of Pink Floyd, Ray Davies of The Kinks and Nile Rodgers of Chic, as they re-visit old recordings, re-assess the out-takes left in the vaults and consider why some tracks - and even complete albums - lie unreleased for years.

BBC Radio 4 can be heard on FM and DAB radio, digital cable, satellite and freeview, and via the BBC website where they have the excellent "Listen Live" and "Listen Again" facilities, allowing you to hear the broadcasts for up to seven days following transmission. Our thanks to John Myles for the info.