There are no more rock stars - the last one died in 1994.
Vince Gill, Emmylou Harris and Lyle Lovett are just a few of the artists who have looked to Clark for insightful, intelligent songs.
Known in America for the hit "If You Leave," OMD is a huge influence on modern electronic music.
Medley looks back on "Unchained Melody" and "You've Lost That Lovin' Feelin'" - his huge hits from the '60s that were later revived in movies.
The Doobies guitarist and lead singer, Tom wrote the classics "Listen To The Music," "Long Train Runnin'" and "China Grove."
The renown rock singer talks about "The House of the Rising Sun" and "Don't Let Me Be Misunderstood."