write 2 pages (double space) with watching three videos. 

STOCKHAUSEN, Karlheinz
http://en.wikipedia.org/wiki/Karlheinz_Stockhausen
Stockhausen is one of the 20th century’s foremost eclectic and experimental composers. He is known mostly for his pitch-based compositions such as his piano works and electronic mixtures with voice and works with percussion. But he aimed for more intensity, sonic complexity in his piece combining helicopter sounds + flight + string quartet instruments + vocal sounds. The Wiki page has details about this unusual piece.

STOCKHAUSEN: “Helicopter String Quartet”
ABOUT http://en.wikipedia.org/wiki/Helikopter-Streichquartett
HEAR http://www.youtube.com/watch?v=13D1YY_BvWU&feature=related

WRITING hints: Is this pitch, noise, both? Is there any recognizable structure/ plan? Flight formation?
How is tension created? Are any sounds percussive? Are there rhythm patterns or a pulse?
How is this multi-media? Are electronics used? Is the venue  typical? 
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HANATARASH, 1980s noise band: Noise aesthetic.  Counter-culture (not in the mainstream).
The performance uses a variety of noise-making objects, including power tools, drills, and heavy machinery (bulldozers), vocal shrieks and yelling, shrill and persistent electronic feedback. Danger and destruction are part of their shows. Sometimes the venue itself is damaged and destroyed.
ABOUT: http://en.wikipedia.org/wiki/Hanatarash
Counterculture http://theendofbeing.com/2010/05/19/hanatarash-backhoe-concert-slideshow/
http://en.wikipedia.org/wiki/Counterculture

 HANATARASH performance  http://www.youtube.com/watch?v=TPuf2adIwZ8

WRITING hints:  What is your impression of the performance? Was this planned? Is this also theater?Performance art? What would an audience of fans find interesting about it? What does it express? Is this performance only about the sound, or are there psychological effects it evokes from the listener-viewer? Was this planned? What are the sonic “instruments”?  What if you hear only the sounds without seeing an image?

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And now…for something different. 
Machine sounds +digital sampling/editing, pitch+noise+image used in an aesthetically different expression from the above music:

 R.D. JAMES also know as “APHEX TWIN”. British electronic (“electronica”) musician/composer.
http://en.wikipedia.org/wiki/Aphex_Twin

      Aphex Twin: “Nannou”, 1999  (mechanical sounds+pitch tones of a music box)
R.D. James (Aphex Twin) digitally sampled sounds of a music box to create his composition Nannou.
He used  sonic elements of the music box including pitch and noise sounds (such as the windup key “noise” sounds.) He edited and mixed these sonic elements to create a composition. The work was featured in a film.

ABOUT music boxes  http://en.wikipedia.org/wiki/Music_box
HEAR: Aphex Twin: “Nannou”: https://www.youtube.com/watch?v=A-Pkx37kYf4

WRITING hints: how does this music differ from the Hanatarash and Stockhausen? How is this an organized work?  Is there a steady pulse?  What starts to happen at around time 2:35 on the Youtube video?  How did the mechanical function of the music box influence the musical work itself? What is the affect of this music?