Check out this orchestral remix I made of the Ruins and Waterfall theme. Toby Fox is an amazing and aspiring musician. He is really good at making themes fit a certain atmosphere. He also uses leitmotifs, by that I mean he uses the same rhythm or melody in multiple songs. For instance, Waterfall is a remix of the Ruins theme. I took advantage of this and made a smooth transition between the two for this orchestration.
 
https://www.youtube.com/watch?v=yVobGjs7KSQ