Edgard Varese: Octandre
Scored for contrabass and seven woodwinds, Octandre is a very short piece in three movements (lasting about 6 minutes in total). Varese makes great use of the extremely high registers of the flute and the oboe, incorporating sounds from those instruments' registers and huge intervalic leaps into the technically challenging thematic material. Furthermore, he manages to get a huge sound out of just seven instruments.
This is a piece that is not pleasant at all, but it still affects the listener. It makes sense... but at the same time, it doesn't. Anyway, check out some videos if you're curious.
Part 1- Assez lent
Part 3- Grave
You're on your own for Part 2, Tres vif et nerveaux. That is, until I can actually get a video.