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.
When Judd Apatow needed under-appreciated rockers for his Knocked Up sequel, he immediately thought of Parker, who just happened to be getting his band The Rumour back together.
From the cowbell on "Mississippi Queen" to recording with The Who when they got the wrong Felix, stories from one of rock's master craftsmen.
Was Janet secretly married at 18? Did she gain 60 pounds for a movie role that went to Mariah Carey? See what you know about Ms. Jackson.
Just like Darrin was replaced on Bewitched, groups have swapped out original members, hoping we wouldn't notice.
Collaborating with T Bone Burnett, Leslie Phillips changed her name and left her Christian label behind - Robert Plant, who recorded one of her songs on Raising Sand, is a fan.