Expect the unexpected on this journey through the BBC’s magical music archives, a Top 40 with a difference. In a Top of the Pops-free-zone, these are the surprising songs and rare performances that aren't seen every day, taken from shows that may have been forgotten - but that definitely deserve to see daylight once again. And whilst some of the musical moments may have been hidden away, the talents involved have always been prominent - ranging from Jimi Hendrix to MC Hammer, from Dusty to Tammy, and from The Beach Boys to The Pet Shop Boys.