function syncGlobal(hours) {
    /*
    Get all of the hour selectors
    */
    var currentHourSelectors = document.querySelectorAll(".amplitude-current-hours");

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

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

@access public
@param {number} hours 	- An integer conaining how many hours into the song.