Gabriel Yared worked on his Troy score for almost a year only to have it rejected as "overpowering and too big, old fashioned" a mere month and a half before the film's premiere. Read the full story in his own words here: http://thescreamonline.com/film/film4-3/yared.html
He did make some of the music available for download on his web site but had to remove it as it belonged to the film company and was not his to share.
But here it is. :-)