Type alias MembraneContents
MembraneContents: ["bass drum" | "bass drum on side" | "bongos" | "Chinese tomtom" | "conga drum" | "cuica" | "goblet drum" | "Indo-American tomtom" | "Japanese tomtom" | "military drum" | "snare drum" | "snare drum snares off" | "tabla" | "tambourine" | "tenor drum" | "timbales" | "tomtom"]