At the end of Part 1 that's Schostakovich's musical signature being played with there, correct key even. The repeated figure and variations using D Eb C B. Real fan stuff! O hadn't heard this record before. Superb.
It's called Sound Collage. Its quite interesting actually... where do you draw the line to call something music or not. If you find this interesting search up "4, 33" by "John Cage".