Recently in Jambe's SW Begins thread, the temp track for the opening crawl was brought up as Korngold's "The Seahawk":
http://www.youtube.com/watch?v=kmUUN1UVUE0
SWBegin's thread:
http://originaltrilogy.com/forum/topic.cfm/Star-Wars-Begins-85-Complete/topic/7307/page/24/