Neo Museum Volume 1 Nouvelles ethnologiques de l' obscur Museum (1986)

Some crazy RIO material here for a complete change in direction on this post. I'm pretty sure this is the least popular style of progressive music out there, though one can never fault them for the creative stretching incorporating atonal elements and absurdly odd melodies or chords.
This band made only one LP.  It's very similar to all other chamber-prog angular, quasi-atonal music from the era that I've posted before on these pages, and I suppose that's one drawback of the style, particularly when you get to the aleatory true atonal music of Berg or Schoenberg, creations begin to sound quite boring when there is no tonic to hang on to through the temporal progression of the musical work.  So I would say that for that reason atonal is truly a dead end, with the best works staying on the edge of that chaos and not going overboard, similar to the way scientists will speak of the functioning of consciousness as on the very edge of chaos (compared to complete order, which would be over-simplistic).  Without a tonic key certainly it becomes hard to get any kind of dramatic movement in a piece.  Nonetheless, some artists are really successful at it, I think particularly of the composition Igor's Ascension done by Japanese outfit Azabu etc.   Therein the drama came from the way dissonances kept moving around the scale and the originality of the arrangement of musical instruments.  Perhaps the closest similar artist would be famed French nutheads Etron Fou Leloublan, if you know them.  They sang on their works, but this is all instrumental.  At times, there's enough drama in the music to evoke classic instrumental King Crimson (Lark's Tongue).

Track B1, Premier Element: