The story takes place aboard a battleship staffed by anthropomorphic cats (which strangely look more like dogs with their small ears), most of whom are singing "The Song of the Marines (Shovin' Right Off Again)" as a chorale group.
On the battleship, anthropomorphic cats, resembling dogs with their tiny ears, mostly sing "The Marines' Hymn (Shovin' Right Off Again)" in unison, forming a choir group.