Isn't it beautiful? Totally captures the mystery and romance of the Highlands of Scotland, while cleverly mixing together The Skye Boat Song's melody with lyrics paraphrasing Robert Louis Stevenson's poem Sing Me a Song of a Lad That is Gone (with lad altered to lass).
I find composer Bear McCreary's arrangement very evocative and often hum this track around the house. I even bought it on iTunes! My only complaint is how it doesn't last long enough because OUTLANDER's opening credits are only 93-seconds long. It gets cut short after a brilliant key change, and there's no extended version on iTunes. Maybe they'll release one soon and get another 99p out of me...