It's so odd that, of any song to sample, they use Polovetsian Dances 

I'm Stuff

Homestuck - Homestuck [Vol. 5]

I don't own this, bluh bluh, Copyright Andrew Hussie, Enjoy Album 5!

A new experience in the electronic music style of the late 1970s

All credit goes to Clark "Plazmataz" Powell. Buy the album to support him. https://homestuck.bandcamp.com/album/homestuck-vol-5-6-with-the-felt