SOURCES:

The Beatles, North Korean thing, and other stuff is mine!

Pony Dubstep and Another Pony Song was by Black Gryphon
https://www.youtube.com/watch?v=Aq33DflgDu8

Only a Muffin was by Eile Monty
https://www.youtube.com/watch?v=zazGtw6rAGw

Babs Seed Remix was by dBPony

Kazoo Song was by SuperRedkiwii·
http://youtu.be/bzwBtnTRnRU