United Kingdom, Nov. 4 -- Sir Paul McCartney was inspired to form Wings after seeing country star Johnny Cash performing with his wife June Carter.

The Beatles legend posed the question of starting a band to his late wife Linda McCartney after seeing the couple on stage together as he was searching for a purpose following the Fab Four's break up in 1970.

McCartney writes in his new book Wings: The Story of a Band on the Run: "I remember thinking: 'Wow, he's put some people around him.' I turned to Linda and said: 'We could do that. Do you fancy being in a band?'"

Linda - who passed away from breast cancer in 1998 - recalled: "I just said: 'Yeah.'

"I must have been out of my mind."

Paul's two solo albums before forming Wings - 1970's ...