Webb talks about his classic songs "By the Time I Get to Phoenix," "Wichita Lineman" and "MacArthur Park."
An interview with Frankie Valli, who talks about why his songs - both solo and with The Four Seasons - have endured, and reflects on his time as Rusty Millio on The Sopranos.
Brenda talks about the inspiration that drove her to write hit songs like "Get Here" and "Piano in the Dark," and why a lack of formal music training can be a songwriter's best asset.
Tom talks about the evolution of Cinderella's songs through their first three albums, and how he writes as a solo artist.
The Scorpions and UFO guitarist is also a very prolific songwriter - he explains how he writes with his various groups, and why he was so keen to get out of Germany and into England.
The man who created Yacht Rock with "Sailing" wrote one of his biggest hits while on acid.
Ian Anderson wrote "Aqualung" after looking at pictures of homeless men that his wife took. She got a co-writing credit on the song.
Bob Dylan's four handwritten pages containing the original draft of "Like a Rolling Stone" fetched over $2m at Sothebys New York in June 2014 setting a price record for a popular music manuscript.
"I Guess That's Why They Call It The Blues" by Elton John was written for the sister of actress Rene Russo. Bernie Taupin, who wrote the lyrics, was married to Rene's sister, Toni.
"Bad, Bad Leroy Brown" is about a guy Jim Croce met in the National Guard, which Jim joined to keep him out of Vietnam. Leroy went AWOL, but got caught when he tried to pick up his paycheck.
"Torn" by Natalie Imbruglia was first recorded by the group Ednaswap in 1993. It was written by Ednaswap's Anne Previn and Scott Cutler, who went on to write some hits for Miley Cyrus.
Scott Stapp of Creed wrote "With Arms Wide Open" when he found out he was going to be a dad. He named his son Jagger.