title: Audio spectrum extraction from audio file by python
body: <p>Sorry if I submit a duplicate, but I wonder if there is any lib in python which makes you able to extract sound spectrum from audio files. I want to be able to take an audio file and write an algoritm which will return a set of data {TimeStampInFile; Frequency-Amplitude}.</p>
  
  <p>I heard that this is usually called Beat Detection, but as far as I see beat detection is not a precise method, it is good only for visualisation, while I want to manipulate on the extracted data and then convert it back to an audio file. I don't need to do this real-time.</p>
  
  <p>I will appreciate any suggestions and recommendations.</p>