Terry Riley: A Rainbow in Curved Air

This work is mesmerizing. The structure appears to be very clear. When it begins, it establishes an undertone to be the foundation of the sound. The interjections of synthesized sound makes random excitement within the piece. You never know when the interference it going to happen. When the listener is taken by surprise, then it seems more desirable to chance.
Towards the middle of the piece, it seems like there is an attempt to have a series of tone with some organization. The tones range from high pitch to low and also speed and slow. It shows Riley's craftsmanship with his art. A little past halfway through, the chaos picks up and it seems to pop with excitement. The sounds speed up intensely with more interjections and outbursts.
Three-quarters of the way through, the underlying sound-base disappears for a bit, appearing to be the climax. It is matched with high pitched tones repetitively streaming across the spectrum.
For the last minute and a half, there is a gentle sound of something like a chain shaking. It is calming to the listener, for a break in the repetition. And finally, the hint of tones comes back vaguely at first to remind the theme to the listener. And it fades out with more repetition, suggesting that the music lives on.
This work, and minimal work are refreshing to the ear. It makes the listener really hone in on the message in which the composer if intending. It also suggests that the repetition will continue long after the track is turned off. Terry Riley and other 'minimalistic' composers have been influenced by La Monte, the father of minimalism.
With loop, pattern, and light structure these artists have a unique and lasting design for excellence.
Here's the youtube link: http://www.youtube.com/watch?v=apxuRKWmEJs