Joe talks about the challenges of of making a Duke Ellington tribute album, and tells the stories behind some of his hits.
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.
Did Eric Clapton really steal George's wife? What's the George Harrison-Monty Python connection? Set the record straight with our Fact or Fiction quiz.
A talented lyricist, Philip helped revive Neil Sedaka's career with the words to "Laughter In The Rain" and "Bad Blood."
There are no more rock stars - the last one died in 1994.
What are the biggest US hits with French, Spanish (not "Rico Suave"), Italian, Scottish, Greek, and Japanese titles?