Actually, it is just a modified version of one very-very old cover. Unfortunately, I can't even find the nickname of the person who created the first version. If you know who it was, i would be happy to credit him.
Original score (i guess??? i'm not sure): https://yadi.sk/i/tpwJfaMhypkIcA
Original:    • Homestuck [S] Jack: Ascend  
Midi: https://yadi.sk/d/azu2zlJv61MHlA
Audio version: https://yadi.sk/d/t9jn7WBMRRLZQg
Sheet music: https://yadi.sk/i/U5G3qnrsWE_THw