Everyone knows the words - "When I find myself in times of trouble, Mother Mary comes to me, speaking words of wisdom: Let It Be."

For years, Paul McCartney has explained "Mother Mary" was his own mom, who passed away and came to him in a dream. When I first heard it, I wondered if it was an allusion to be a religious figure.

But there's yet a third explanation and it involves a member of one of the Beatles own crew - who may have originally been named in the song. 

See what you think.

The heartbreaking true story behind The Beatles' song Let It Be