MetalContents: ["agogo" | "almglocken" | "bell" | "bell plate" | "bell tree" | "brake drum" | "cencerro" | "chain rattle" | "Chinese cymbal" | "cowbell" | "crash cymbals" | "crotale" | "cymbal tongs" | "domed gong" | "finger cymbals" | "flexatone" | "gong" | "handbell" | "hi-hat" | "high-hat cymbals" | "jaw harp" | "jingle bells" | "musical saw" | "shell bells" | "sistrum" | "sizzle cymbal" | "sleigh bells" | "suspended cymbal" | "tam tam" | "tam tam with beater" | "triangle" | "Vietnamese hat"]