code: def get_biographies(self, results=15, start=0, license=None, cache=True):
          
          if cache and ('biographies' in self.cache) and results==15 and start==0 and license==None:
              return self.cache['biographies']
          else:
              response = self.get_attribute('biographies', results=results, start=start, license=license)
              if results==15 and start==0 and license==None:
                  self.cache['biographies'] = ResultList(response['biographies'], 0, response['total'])
              return ResultList(response['biographies'], start, response['total'])
docs: Get a list of artist biographies
          
          Args:
          
          Kwargs:
              cache (bool): A boolean indicating whether or not the cached value should be used (if available). Defaults to True.
              
              results (int): An integer number of results to return
              
              start (int): An integer starting value for the result set
              
              license (str): A string specifying the desired license type
          
          Returns:
              A list of biography document dicts; list contains additional attributes 'start' and 'total'
              
          Example:
  
          >>> a = artist.Artist('britney spears')
          >>> bio = a.get_biographies(results=1)[0]
          >>> bio['url']
          u'http://www.mtvmusic.com/spears_britney'
          >>>