There are so many remixes and arrangements on Youtube, much like the ones Aeroprism (Nekoprism) makes.
Lets link as many as we can in this board post, and be sure to thank the great people who made them as you listen to them!
Algo first (I'll go first:)
Here is a playlist I created with several songs from great arrangers.
https://www.youtube.com/watch?v=hm1ZjmP ... W1YUnl4W4a
I did not include Aero's great songs. Figure he'd want to.