code: def desc(self):
          
          desc = "SA_RINCON{}_{}".format(
              self.account.service_type, self.account.username
          )
          return desc
docs: str: The Sonos descriptor to use for this service.
  
          The Sonos descriptor is used as the content of the <desc> tag in
          DIDL metadata, to indicate the relevant music service id and username.