code: def get_urls(self, cache=True):
          
          if not (cache and ('urls' in self.cache)):
              response = self.get_attribute('urls')
              self.cache['urls'] = response['urls']
          return self.cache['urls']
docs: Get the urls for an artist
          
          Args:
          
          Kwargs:
              cache (bool): A boolean indicating whether or not the cached value should be used (if available). Defaults to True.
              
          Results:
              A url document dict
              
          Example:
  
          >>> a = artist.Artist('the unicorns')
          >>> a.get_urls()
          {u'amazon_url': u'http://www.amazon.com/gp/search?ie=UTF8&keywords=The Unicorns&tag=httpechonecom-20&index=music',
           u'aolmusic_url': u'http://music.aol.com/artist/the-unicorns',
           u'itunes_url': u'http://itunes.com/TheUnicorns',
           u'lastfm_url': u'http://www.last.fm/music/The+Unicorns',
           u'mb_url': u'http://musicbrainz.org/artist/603c5f9f-492a-4f21-9d6f-1642a5dbea2d.html',
           u'myspace_url': u'http://www.myspace.com/iwasbornunicorn'}
          >>>