Interesting! Reminds me a lot of this documentary about shape-note singing or "Sacred Harp" singing (described as a "lost tonal tribe"):
Just for the record. My thoughts were coming from the idea that the music didn't fit the trailer, not that I didn't like her song. Of course she probably would have composed the music for the film and not really the trailer, so even if the music doesn't have quite the right fit with the trailer this doesn't necessarily mean that it won't sound fine in the movie.
I like Julie better than Celtic Woman as well. She's a little more traditional it seems.
It's kind of cool that she went to the Hebrides and studied Gaelic Psalm singing. The Hebrides is a beautiful area, as can be seen here.
It's interesting to note that the Carmina Gadelica (a book full of poetry and songs taken from mostly Hebridean people in the late 1800's) makes mention of Christian folk singing in different tones than normal. It's not widely known that the early medevial Catholic Church changed the tones of music from the tones that were used by the Hebrew people and the early church (I'm not sure why they changed it). There is some speculation that people in the Hebrides and possibly other fringe Gaelic areas of the British Isles had retained the old musical tones.
Sorry to highjack the thread. We have discussed this film, Awake My Soul: The Story of the Sacred Harp, on A&F previously. It's glorious.