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