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If you don't believe music is the food of love then this heartbreakingly beautiful video will change your mind.

It has become a hit on social media and touched tens of thousands of people with one writing: "This has brought huge smiles to my heart. Thanks."

Posted by a man calling himself Roy Thigpen, it shows his 91-year-old father, George, dancing enthusiastically as his 82-year-old wife plays the piano with her back to him.

The two have been married for 56 years, but it does not stop George from delighting in every step to the music as his wife's fingers flit lightly across the keys.

She is playing La Galopera, a traditional polka from her native Paraguay that the two of them danced together many times in their youth.

Young at heart George dances as nimbly as he can around the front room floor of his American home, at one point twirling a walking stick around his body as if it were his partner.

He finishes with a flourish, moving towards the woman he so clearly loves and patting her on the back as the music dies to let her know he matched her note for note.

For her part, she is delighted that he - and she - are still crazy about each other after all the years.