title: How Shazam or Sound Hound works?
body: <p>I'm developing an <strong>iOS</strong> application with <strong>SDK for iOS 5.0 and XCode 4.2</strong>.</p>
  
  <p>I want to develop an application that recognize sounds. I see there is an application called <strong>Sound Hound</strong> that recognize music and tells artist and title.</p>
  
  <p>How can I do something similar? I want to compare a sound to an existing sound database.
  How can I do that?</p>
  
  <p>Maybe I can use <strong>Fourier Transform</strong>. I don't know how to process sounds. Or it could be similar to speech recognition, isn't it?</p>