From The Fountain, Clint Mansell’s “Together We Will Live Forever” :
http://www.youtube.com/watch?v=4XZkLmomNgA
From Moon, Clint Mansell’s “Memories”:
http://www.youtube.com/watch?v=EmhVRQuEoPg&feature=related
From Gladiator, Hans Zimmer’s “Earth”:
http://www.youtube.com/watch?v=6AMnOFmwMSs
From Sunshine, John Murphy’s “Sun Still Shine”: