RUMBLING, RUMBLING, IT'S COMING – So here it is, the last opening song for the whole Attack on Titan Anime series: "The Rumbling" from SiM! This piece offered me unique obstacles on the piano due to the fact that how does one organize a metalcore music on a single piano? Sometimes, I feel like even 88 secrets are not even enough. However prior to I continue, I want to ask you something: Doesn't the…