McCullough, who grew up in Portstewart, Co. Derry, passed away four years after suffering a severe heart attack that left him incapacitated.
As well as playing with Sir Paul McCartney’s band for two years, McCullough jammed with Joe Cocker at Woodstock and appeared on the original recording of Jesus Christ Superstar.
A career highlight was his improvised guitar solo on Wings’ My Love from the album Red Rose Speedway.
He also played on the theme song for the James Bond film Live and Let Die, but ended up leaving Wings after clashing with Sir Paul.
The two made up, however, with McCullough telling the website Musiclegends in 2011: “Just because there’s a little hiccup along the way, it doesn’t take away from what you’ve built up.”
And Sir Paul was one of the first to pay tribute to his former bandmate, describing his My Love solo as a “classic he made up on the spot”.
“He was a pleasure to work with, a super-talented musician with a lovely sense of humour,” the former Beatle said. McCullough also worked with George Harrison’s label, Dark Horse, which produced his 1975 solo album, Mind Your Own Business. He also one of the voices heard answering questions at the end of Pink Floyd’s Money, when he says: “I don’t know, I was really drunk at the time.”