text: /**
   * @license
   * Copyright 2017 Google LLC
   * SPDX-License-Identifier: Apache-2.0
   */
  const MusicMaker = {
    queue_: [],
    player_: new Audio(),
    queueSound: function(soundUrl) {
      this.queue_.push(soundUrl);
    },
    play: function() {
      const next = this.queue_.shift();
      if (next) {
        this.player_.src = next;
        this.player_.play();
      }
    },
  };
  
  MusicMaker.player_.addEventListener('ended', MusicMaker.play.bind(MusicMaker));
  