Apparently, if you slow down John Williams's 3-minute Jurassic Park theme 1000%, you get a pretty gorgeous 54-minute "ambient symphony." I've only heard the first couple minutes, but it's nice. Soothing.
(I confess I may be a bit biased. I saw Jurassic Park in the theater more times -- nine -- than any other movie. That includes opening night, first run theaters, second run theaters, dollar theaters, and a drive in...)