Laurie Anderson is aiming for a different aesthetic. The music is only part of the show. The lighting and text effects, plus the narration are dramatic and effective. The variation is provided by the interplay of the music, lighting, text on the screen, and voice over. The show succeeds in establishing its unique aesthetic, but I desire to experience that "mood" for only an hour at most.
The opening first half hour had some interesting string music that seemed to be going somewhere. But after that much (not all) of the music is based upon underlying ostinatos of short repetitive sequences that rock gently between two chords. Did not hear a lot of motivic or thematic development, or even a single recognizable V7 - I resolution. The musical devices used to build excitement were limited to playing more notes per measure, string harmonics, crescendo decrescendo. All the players were very skillful. The viola is featured on many tunes.
I credit Laurie Anderson with combining different audio/visual elements in a unique way, and with successfully creating a hypnotic "ambient" experience, but I find the "mood" not worthy of an 1:45hr show. I simply do not wish to feel one feeling for that long.
NOTE: mine is decidedly the minority opinion. The performance received an extended enthusiastic standing ovation.