Twilight Sparkle likes her radio, but out in Ponyville she has to find new stations to listen to. Ones that are unfamiliar.
Late one night she turns on her radio and finds a station called Lost Sun Radio. The host is complaining about the latest events and changes to the town and vows to prove the elements of harmony exist, despite the wishes and words of the Princess and Twilight and her friends.
He promises to prove this with violence. Murderous violence.