I was watching this documentary on Dante Rossetti and it's a whole series on different artists and they play this piece of music at the beginning of every episode and I love it! But I don't know what it's called. I'll link it here and it's the first song in the video (as in the first thing you hear). Here you go and thanks for your help!
Most Helpful Guy
It's Schubert's symphony number 5 in B flat.