function syncSong(hours) {
    if (_config2.default.active_playlist == null) {
      /*
      Get all of the hour selectors
      */
      var currentHourSongSelectors = document.querySelectorAll('.amplitude-current-hours[data-amplitude-song-index="' + _config2.default.active_index + '"]');

      /*
      Set the current hour selector's inner html to hours passed in.
      */
      for (var i = 0; i < currentHourSongSelectors.length; i++) {
        var playlist = currentHourSongSelectors[i].getAttribute("data-amplitude-playlist");

        /*
          Updates the current hour selector for a global display.
        */
        if (playlist == null) {
          currentHourSongSelectors[i].innerHTML = hours;
        }
      }
    }
  }
Syncs the song hour elements.

@param {Integer} hour - The current audio hour.