United Kingdom, Sept. 24 -- Graham Nash is still desperate to collaborate with Sir Paul McCartney.

The 83-year-old music legend is highly regarded for his work with The Hollies and as part of Crosby, Stills and Nash, but despite his Rock and Roll Hall of Fame career, there's still one specific goal he hopes to tick off involving The Beatles icon.

He told The Times newspaper: "I've sung with my heroes the Everly Brothers and played to half a million people at Woodstock.

"But one thing I'd still love to do is sing two-part harmony on Yesterday with Paul McCartney.

"I hope he'll see this as an invitation."

1965 classic Yesterday was on the Help! album, and effectively acted as Fab Four's first solo performance, featuring Macca on vocals...