On Glen's résumé: hit songwriter, Facebook dominator, and member of Styx.
Rupert crafted hits for Tina Turner, Howard Jones and The Fixx.
She thinks of herself as a "song interpreter," but back in the '80s another country star convinced Emmylou to take a crack at songwriting.
Jim talks about the impact of "The Middle" and uses a tree metaphor to describe his songwriting philosophy.
Justin wrote the classic "Nights In White Satin," but his fondest musical memories are from a different decade.
In her days with The Runaways, Joan Jett saw The Arrows perform "I Love Rock And Roll," which Alan Merrill co-wrote - that story and much more from this glam rock pioneer.