Song and magic are two parts of the same whole in Equestria. When Rose saw Anon, it was love at first sight, and as if to shake any doubt, she heard their song. It was the happiest moment of her life. Until she realized he couldn't hear it.
Spitfire receives terrible news. An injury she sustained from their last show may have saved lives... but may not be treatable. They will have to amputate her wing. She must step down as Wonderbolt captain.