Originally Posted by: Weslabawhen he hears any 2 notes he can tell you what the distance between them is.

Everyone by second year in my jazz school has to be able to do that. We have ear training tests on intervals, chords, melodic and rhythmic dictation all the time. Some people struggle with it, true, but that sort of stuff requires not as much practice as you would think.

Edit: Try the program Auralia, it's a fantastic ear training tool.