title: Extract frequency and dB from mp3 file
body: <p>given an mp3 file, I'd like to be able to extract a list of lists with frequency and dB reading for each frame of an audio file. </p>
  
  <p>[[f_1, db_1], [f_2, db_2], ..., [f_n, db_n]]</p>
  
  <p>I've been able to find the following code, which displays frequency and dB in a graph, here: <a href="http://nbviewer.jupyter.org/github/librosa/librosa/blob/master/examples/LibROSA%20demo.ipynb" rel="nofollow noreferrer">http://nbviewer.jupyter.org/github/librosa/librosa/blob/master/examples/LibROSA%20demo.ipynb</a></p>
  
  <p>I've tried to read through the source code and determine a way to take the values used as inputs for the graph to convert them to the data structure I need, but I don't understand enough about audio processing terminology to understand what the source code is doing. </p>
  
  <p>I'd appreciate any help on this project. </p>
  
  <p>Thank you. </p>