First of all, I have to tip my hat to the makers of those demos, and doff it cordially. As an avid music collector, I will honestly say that all four snippets have been much better than I have expected.
Second, the first two snippets are really too short to form a good opinion, but I will try anyway.
Third, as the PHB would say: 'Let's do both!'. I mean, can't you get those two to collaborate? Is there no way of accomplishing this? Listening to those tunes makes me think that one artist would be better suited to secular settings and town music, the other for epic stuff ala Soule. [And Soule composed some really good soundtracks, let's just think of Total Annihilation]
On to the nitty-gritty!
#1
AoD.mp3 (0:29)
This one would make a fine camp, small village or evening music. It's calm and soothing, the melody is very simple, but most good ones are. It could become tiresome and repetitive if it continues in this style for more than 1 minute and, say, 30 seconds. Said whistle is also a tiny bit too high pitched to my ears. If it was just a tiny bit lower, it would be hauntingly beautiful.
The style seems to go well with your setting, too.
I give this seven out of ten tubgirls. [7/10]
AoD2.mp3 (0:32)
Hmm, what to say? It sounds well suited for a harbor town, while in its outskirts, or a fortified one, but by benevolent fortifiers. The melody seems a bit more complex in this one, and the scarce use of instruments and the clever application of a brass instrument in the background make this a well thought-out demo, but sadly, it's far too short to correctly judge it. Still, it doesn't move me as much as the first one, and doesn't convey as much atmosphere. Very fitting style, though.
I give this six out of ten goatse.cx'. [6/10]
#2
F Aod.mp3 (1:28)
Ah, this starts out nicely Arcanumesque, which is a very good thing, It's a pretty moody melody, and the guitar (mandolin? harp? dulcimer?) in the background is a nice touch, especially with its variations that are very subtle. It's a bit anticlimactic, but then, it's just a demo. I feel it would make a good song for the nighttime, or the late evening. Somehow, the style is a bit... Sicilian, which, again, fits the game quite well. Also, it reminds me of the soundtrack to 'Die Gilde', maybe known as Europa 1400 here, which is not a bad thing.
I believe this song earned seven random links to furry porn, and a scat story from Rex. [7.5/10]
F AoD2.mp3 (1:51)
The voice sucks. It needs to be toned down, I think. Or replaced by an oboe, or something. At first, I thought it would be backed up by an orchestra, and at first it sounded like that, but, eck.... it's just an annoying voice. Get rid of that, artist #2! It sucks so much that the melody, which is feasible and good, actually suffers. Also, the choice of instruments must be reworked. However, 0:50 to 1:15 are excellent, especially at the beginning, when all the instruments kick in. I would replace the flute that tries to harmonize with the voice by a pan-flute, and, of course, rid the voice, in the parts that follow. No, forget the pan-flute, just substitute the voice. The style does NOT fit your game, from what I have read about, but maybe that's just because the voice really spoils it for me.
This gets five posts from Volourn, out of ten. [5/10]
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Seems like the first artist won by 0.5 points. However, if that is deserved, I can't say, because the demos of him were short.
Overall, his style is more up my avenue, though.