The story begins with the girl is getting married and her father played Canon in D as a gift and memory of her dead mother who played the same song as well when she was young and before she died. When her mother died, she didn’t talked to her father that much and abandoned playing the piano. The father understands her daughter so he tried to learn the song that his wife used to play. It was a gift for his daughter.
Canon in D is hard to play in the piano as it is not really arranged for piano but for violin.