Terry Riley is
by all means a serialist composer.
I tend to put Reich and Riley in the same category although Reich is rather minimalistic or whatever.
As far as interweaving patterns and loops and stuff these two go together quite well.
I'm no specialist or expert but i don't think i'm giving false data here.
+++
i say "muzak" instead of "music" pretty often. It's not meant to be clever or anyhing.
so yeah.