Another thing to bear in mind is that Williams originally composed a different piece for the end of AOTC which would lead into the love theme.
Lucas though, with all his lack of wisdom prefered to have the IM plopped in ....nice one GL.
You can hear a second or so of what was originally intended in the Across The Stars music video at about 51 seconds in.
http://www.youtube.com/watch?v=aqE7bm11WJo
My God, how I would love to hear the original full piece!