Ustvolskaya (1919-2006) was a Soviet/Russian composer and pupil of Shostakovich. Her uncompromising music is not the easiest to appreciate, but I find it is extremely rewarding. Her fifth symphony (Amen) from 1990 is typical of her sparse style. It is scored for reciter, violin, oboe, trumpet, tuba, and percussion (a wooden cube). Relevant links below.