Hard Chord has been on a "Good stretch" in his life. He's living happily with Twilight Sparkle. His brother managed to make amends. He worked to save an empire. But he still has his father, a depressed, insulting, drunk. When he shows up at Ponyville at the same time Electronic Notes visits, it will only end in chaos.
Ending was good made me think of that one Mythbusters episode where they tested something like that.