I just noticed that when playing a track in QuickTime 7 (Pro) that you can adjust the pitch of the song without affecting the vocals! Command-K brings up the A/V Controls screen, from where you can adjust the Playback speed slider. When you do so, the audio and video slow down, but the pitch remains unchanged. This is great news for musicians who want to slow down the beat of a tune and hear exactly what is going on. Now if they could only intergrate it into iTunes...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050529111420639