Well, first he needs to know Mendelssohn's techniques. Then, once he has an understanding of Mendelssohn's techniques, he will have to create a rough draft of the piece. Then, if and when he makes any edits and revises, he will be able to create his final piece.
It’s important because that’s what makes the song memorable and it gives it emotion, it’s highly common in many songs it’s the central idea it’s what brings the song to life
