code: def analysis(self):
          
          if self._analysis is not None:
              return self._analysis
  
          if self.cache_dir is not None:
              path = os.path.join(self.cache_dir, self.checksum)
              try:
                  if self.refresh_cache: raise IOError
                  with open(path + '.pickle', 'rb') as pickle_file:
                      self._analysis = pickle.load(pickle_file)
              except IOError:
                  self._analysis = librosa_analysis.analyze_frames(self.all_as_mono(), self.samplerate)
                  with open(path + '.pickle', 'wb') as pickle_file:
                      pickle.dump(self._analysis, pickle_file, pickle.HIGHEST_PROTOCOL)
          else:
              self._analysis = librosa_analysis.analyze_frames(self.all_as_mono(), self.samplerate)
          return self._analysis
docs: Get musical analysis of the song using the librosa library