Also, I like to think of the opening flute as a motif for the beginning of a “Star War”. In ANH, the movie starts at the beginning of the civil war basically, right after the rebels first victory and their subsequent escape.

In TLJ, we follow up the immediate aftermath of the first real battle of the war, the attack on Starkiller Base, and then the movie starts with the subsequent escape of the Resistance.

What I think would be rather fitting is if the flute motif was added to Attack of the Clones, and we hear it after the Battle of Geonosis, the first battle of the war, specifically when Dooku’s ship is escaping the planet.