Doubt led to drive for Francis, who still isn't sure why one of Status Quo's biggest hits is so beloved.
Laura Nyro talks about her complex, emotionally rich songwriting and how she supports women's culture through her art.
A top session musician, Carol played on hundreds of hits by The Beach Boys, The Monkees, Frank Sinatra and many others.
Rupert crafted hits for Tina Turner, Howard Jones and The Fixx.
Billie Jean, Delilah, Sara, Laura and Sharona - do you know who the girls in the songs really are?
Richard explains how Joe Walsh kickstarted his career, and why he chose Hazard, Nebraska for a hit.