I haven't listened to the CD you linked to, so I can't tell you what it's like.
With regard to the Arevakal service, I don't know for sure about the accuracy of the information. The Narek site that makes that statement is not really a religious site, so who knows who wrote it.
There is some truth to the statement that the Armenians before Christianity worshiped fire and, I think, even the sun. I seem to recall being told that in preChristian times, villages would have a person whose job it was to call for the sun right before sunrise. I seem to recall seeing it in an Armenian movie once, but it was many years ago and I can't recall what the movie was.
It could be that some of this carried over into Christianity. It would make some sense, since images of light are often used to describe Christ. ("I am the Light of the world.") St. Nerses definitely used images of light and the rising sun in the Prime prayers. You see this in the English translation of some of those prayers, which I copied in the OO Prayer thread, reply #2:http://www.orthodoxchristianity.net/forum/index.php/topic,13200.msg183101.html#msg183101
I have a story about the Prime prayers. I love them so much, that I memorized some of them a long time ago in the original Classical Armenian. About 14 or 15 years ago, there was a strong earthquake that struck in the early hours of the morning. If I recall correctly, it was 6.9, or thereabouts. Anyway, my mom was trapped in her bedroom, and it was pretty awful getting her out. She was alright, but the house was an absolute mess and trying to clean up and evaluate the damage was pretty hard with just flashlights and camping lanterns. (When you live in Southern California, you always have some of those in the house. This wasn't our first big earthquake.) The electricity of course was out, and right after a quake, you can't be sure for a while if you can use the gas or even if the water is OK. Then, of course, there were lots of pretty strong aftershocks, which came quickly and often.
Anyway, back to the prayers. It seemed like it was taking forever for the sun to rise, and I was feeling a bit desperate for better light than I could get with something that was battery operated. I went out onto the back porch to get some air, and while I was out there, I just started whispering some of the Prime prayers. Of course, that didn't hurry the sunrise or anything.
But it did help me feel God's presence at a time when I needed it.