title: extracting pitch features from audio file
body: <p>I am trying to extract pitch features from an audio file which I would use for a classification problem. I am using python(scipy/numpy) for classification. </p>
  
  <p>I think I can get frequency features using <code>scipy.fft</code> but I don't know how to approximate musical notes using frequencies. I researched a bit and found that I need to get chroma features which map frequencies to <code>12</code> bins for notes of a chromatic scale. </p>
  
  <p>I think there's a chroma toolbox for matlab but I don't think there's anything similiar for python.    </p>
  
  <p>How should I go forward with this? 
  Could anyone also suggest reading material I should look into? </p>