title: Loading multiple audio files with Python/Librosa issue
body: <p>I am hoping somebody can help me with issue I am having. I am trying to load multiple (i.e. 3) audio files and plot them using Python's Librosa library. I can't spot the error here. </p>
  
  <pre><code>def main():
  pathAudio = "~/Project Data/Practice/Train Music/"
  files = librosa.util.find_files(pathAudio, ext=['ogg']) 
  files = np.asarray(files)
  for y in files: 
      y = librosa.load(y, sr = 16000,mono = True)        
      librosa.display.waveplot(y)
  </code></pre>
  
  <p>The above yields the error:</p>
  
  <pre><code>ParameterError: data must be of type numpy.ndarray
  </code></pre>
  
  <p>Somebody pointed out that it might be the type of y which is causing the issue but I can't spot any obvious error here. </p>
  
  <p>Any advice welcome as this one is proving to be a massive time sink for me. </p>