Imagine you're pretty much at the end of a pretty tough game. The war is almost won, and for it to end you have one obstacle left in your way. A giant fortress in the north, buried in snow. Waves upon waves of enemies. And boss enemy that has the potential to wipe the floor with your team. Then listen to this. The Shadows of Valentia composers really cooked with the soundtrack, in fact, the soundtrack is so good that I might post a few of the songs here, they're honestly good to listen to when playing other games. I turned off music in FE: Blazing Blade just so I could listen to these songs. I've already heard the battle themes in that game, and I'll probably turn it back on when it's an important battle with a potentially unique song, but DAMN. While Sacred Echoes mastered the gameplay aspect, as well as improving upon the writing and the battle animations, the original Shadows of Valentia has the aesthetics of the amazing art and soundtrack. Honestly may upload a couple of the Three Houses songs, becuase many of the people who worked on Shadows of Valentia's soundtrack also worked on Three Houses!
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: