Type alias NoteheadContents
NoteheadContents: ["other" | "arrow down" | "arrow up" | "back slashed" | "circle dot" | "circle-x" | "circled" | "cluster" | "cross" | "diamond" | "do" | "fa" | "fa up" | "inverted triangle" | "la" | "left triangle" | "mi" | "none" | "normal" | "re" | "rectangle" | "slash" | "slashed" | "so" | "square" | "ti" | "triangle" | "x"]