Somber

Hans Zimmer's score for Edward Zwick's samurai epic The Last Samurai mixes his own densely composed style with Japanese instruments and melodies, resulting in a brooding, atmospheric collection of music. Shakuhachi and other flutes, koto, and taiko drums make their presence known throughout the score, most effectively on compositions like "A Way of Life," which begins as a reflective duet for flute and strings before swelling into an ominous but majestic melody. "Spectres in the Fog" is another compelling mix of beauty and violence, starting with a delicate koto melody and rolling drums before crashing percussion and sawing strings turn the mood from bittersweet to battle-ready…

Essential: a masterpiece of progressive rock music
I remembered the first Le ORME album I ever bought. It was "Ad Gloriam", an odd pick given that album isn't what you call progressive (it was psychedelic pop).