This one's for Amaranthine!
Across the Stars, also known as the "Love Theme" is from Star Wars, and is, obviously, by John Williams. John Williams rocks, by the way.
This song was actually playing during one of my more recent dreams (well, it was recent when I wrote this post, not when it was published a few weeks later) and that is what prompted me to use it.
Besides, it's a great example of how instrument choice lays a big role in achieving the desired emotional effect. Think; what would you feel if you heard this song without the harp? What if the melody had been played by a tuba?
Okay, I know... Who would ever think of using a tuba... Silly composer...