Song History and Facts:
McCartney said he had the idea of “Let It Be” after he had a dream about his mother during the tense period surrounding the sessions for The Beatles (the “White Album”). McCartney explained that his mum — who died of cancer when Paul was fourteen — was the inspiration for the “Mother Mary” lyric. He later said, “It was great to visit with her again. I felt very blessed to have that dream. So that got me writing ‘Let It Be’.” He also said in a later interview about the dream that his mother had told him “It will be all right, just let it be.” wikipedia