Does the Tropical Octav3 count as a classic in pony time yet? I'd assume it is. Get an acoustic variant on that, plus another awesome metal song from Reverbrony to go with it. Both below!
1.) All or Nothing By Reverbrony - Mixed and Mastered By Secret Metal (Instrumental - Metal)
2.) MLP Acoustic Cover - A Tropical Octav3 - Coconeru and Steven, A.D (Remix - Acoustic)