code: function getSongArtistTitle (str, options, plugins) {
    if (options) {
      if (options.defaultArtist) {
        plugins.push(fallBackToArtist(options.defaultArtist))
      }
      if (options.defaultTitle) {
        plugins.push(fallBackToTitle(options.defaultTitle))
      }
    }
  
    var plugin = reducePlugins(plugins)
  
    checkPlugin(plugin)
  
    var split = plugin.split(plugin.before(str))
    if (!split) return
  
    return plugin.after(split)
  }
docs: Get an artist name and song title from a string.