Interesting what nice names for metal sub-genres there are ;) URSKUMUG, the first Latvian Extreme Metal band I got into (well, ok, some would call Skyforger extreme too *g*) describe their own style as Tribal Black Metal, and are as far as I know the first ones to call their style that way, too.
Regarding the music the category is quite ok. Many different ethnic sounds can be found, e.g. specific drums, Jews harp, short Latvian (?) spoken passages and some more, although not in an all-dominant way. However, the term Tribal Metal did not cross my mind while listening Am Nodr. On one hand using ethnic instruments and melodies isn’t a very groundbreaking concept nowadays; on the other hand these elements are not often enough used, to coin a new style. For me, URSKUMUG are playing quite “normal” fast Black Metal with melodic influences. The high speed parts, boosted by a well done drum computer, are not very innovative, but solid stuff. I like Am Nodr best, when the Latvians slow down their pace and integrate above mentioned ethnic or exceptional influences. For example, track five Talking As A Shaman's Son is brought forward by a somehow hectic, small keyboard melody, which, at a first listening, seems completely disturbing or even inapplicable, but gives the song a very unique note and a lot of drive. My favorite song of the album is the title-track, which comes up with sinister and partially sort of doomy passages. That arcane and somber atmosphere gets even more intense by the use of appropriate samples and a wailing keyboard. The central part of the song is then really “tribal”, for few moments one gets the feeling to be put into Sepultura’s Roots ;)
Am Nodr turns out very well and is never boring. But as the band sees and sells their selves as “tribal”, that side could or better should have been pointed out much clearer.