title: Audio analyzer for finding songs pitch
body: <p>Is there anyway to analyze the audio pitches programmatically. For example, i know most of the players show a graph or bar &amp; if the songs pitch is high @ time t, the bar goes up at time t .. something like this. Is there any utility/tool/API to determine songs pitch so that we interpolate that to a bar which goes up &amp; down.</p>
  
  <p>Thanks for any help</p>