The song is "Age of Cathedrals" from the musical Notre-Dame de Paris in French, Italian, and Spanish. Since high-rising ゴシック cathedrals of the late 15th century exist in France, Italy, and Spain, I used these three languages.
This is a historical video. Those who don't know this is a video from my country's Winter War and luckily we managed to keep our Independence and it was Russia who started that war not we Finns at all.