protected drawInstrumentBrace(brace: GraphicalObject, system: MusicSystem): void {
        const ctx: Vex.IRenderContext = this.backend.getContext();
        ctx.openGroup("brace");
        // Draw InstrumentBrackets at beginning of line
        const vexBrace: VexFlowInstrumentBrace = (brace as VexFlowInstrumentBrace);