Also on the "melodic" aspect , to my ears what is so great about pieces like
Music in 12 partsis that there is NO foreground/background , so that the idea that some things are "accompaniments" is only a result of the psychoacoustic effects and not something that is "written" , each time you can hear different "melodies" (this is more obvious in pieces by his compatriot Steve
Music for Mallet Instruments , Voices and Organ being one of the greatest examples).
No one did arpeggios like glass (well, maybe Tangerine Dream ?

) but the intensity seems a little lost these days........