Actually, all Nightmare Moons are awesome. Sadly we don't have any Nightmare Moons today, we do have some Luna though, who is like a pre-evolved version of Nightmare Moon.
Genres are next to their specific tracks below!
1.) Cherax Destructor - Go West, Young Dragon (Post-Rock)
2.) F3nning - Reading Rainbow [For BringMeTheHorrigan] (Dub/Glitch)
3.) A Tale Of Luna (Orchestral)
4.) Soaring - ByCelestiasBeard (Trance)