Why do Manchester United play 'Take Me Home, Country Roads' before home games?

The John Denver track is played before every Man United game at Old Trafford, but how did the idea come about?
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Mom's distress after gentle son, 31, was found fatally-injured on deserted country road

An Alabama mother is distraught after her 31 year-old son was mysteriously found dead in the middle of a quiet country road after a night out with a friend. Matthew Wiggins was found badly-injured in ...