It is impossible to tell how pony these songs truly are. As far as I am concerned Trixie was never a dubstep star.
Rarity on the other hoof, makes sense with an orchestral flair. But I suppose if we take something like that, accepting Trixie's dubstep is only fair.
1.) The Lunar War - From Rarity To Extinction (Orchestral/March)
2.) Radiarc - Her Love is a Dragon (Orchestral)
3.) Blaze - Trixie's Illusion (Dubstep)