title: Pitch detection and change java
body: <p>I'm french so I'm sorry if you have trouble to understand some of my sentences.
  Anyways, I saw in some topics that the pitch could be fetected thanks to the Fourier transform
  but I didn't really understand how to implement it.
  Moreover, I didn't find how to change the pitch of a wav file  and if possibl ,a mp3 file
  I am listening to music using javaSound for the wav and JLayer for the mp3.
  Thanks</p>