code: def load_file_librosa(filename):
      import librosa
  
      y, sr = librosa.load(filename, sr=None)
      # print y.mean(), y.shape
      return len(y), sr
  
file_path: aubio/python/demos/demo_reading_speed.py
imports: import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: load_file_librosa(filename) and returns: len,  sr