Everything!

The music and lyrics are pure genius. They are all so deep, meaningful, beautiful, and even fun, scary or romantic. (depending on what song you’re listening to,lol)
But in my opinion, the scores, the pieces without lyrics, are the most powerful. They have a much stronger effect on you, they convey emotions and moods a hundred times better than the songs. They are just so.. strong, they pull you in and you become absorbed by them.