"Grail Overfloweth" by Cocteau Twins is an admittedly stern but neat fusion of psychedelic and dark, resulting in a strange atmosphere. Alien is the best way to describe it.
"Le Gardien de Reves" by Amenra, despite the pretty name that roughly translates to The Guardian of Dreams, is a harsh song dominated by wall of sound dynamics, creating a primal sound.
"White Lake" by Deaf Center captures a harmonic yet tense atmosphere with its piano-dominated music; steadily the piece ascends in musical variety, creating a richer texture.
"Adventure" from the puzzle game FEZ is a fun 8-bit piece with an upbeat sound certainly fitting its name; the limited timbre works to its advantage in creating a narrow but cohesive sound.
"Your Ghost Is Not Enough" by Jessica Bailiff mixes vocals with atmospheric rock instrumentation and synthesizer, creating a song not too far from a slowed down western piece. Calm but persistent drum keeps the song going, not letting the atmosphere become too overwhelming.
"Iron Golem" from the game Dark Souls pits the high pitched against brass instruments, create a driving melody. As a whole the piece successfully captures the epic, making it fun to listen to.
"Sync", also from FEZ, has a more orchestral feel with its solid percussion and melodic instruments creating a rhythm from repetition. The rich dynamics make the piece compelling, even to someone wanting a faster tempo.