Pretty straightforward prog breaks track inspired by the Ancient Castle of the Royal Pony Sisters.

Buy this track: http://jexpsytrance.bandcamp.com/track/castle-of-the-royal-pony-sisters
Or get the album: http://jexpsytrance.bandcamp.com/album/unnatural

Artwork by Moe. Not much more can be said on that. The guy/girl has more or less fallen off the face of the planet, near as I can tell.

Featured on:
EQD - http://www.equestriadaily.com/2013/04/music-of-day-94.html

As always, this wouldn't be possible without http://www.mlptf2mods.com/create/reference-materials for the pony vocals.