2006 (UTC) 

 ::I can't see anything aleatory about the Books' style either.  They use a lot of samples in their music, and there is always a chance element when working with processing and such (i.e. you don't really know how the clip is going to sound when you reverse it, until you've done it).  This isn't aleatory though.  I guess it would be closer to musique concrète.  In any case, I don't think that the Books belong here.  (This is a slightly different topic, but I think that the distinction between Boulez and Cage on this page is unclear.  Cage didn't use the term aleatory, as far as I know, and their conflict had to do with intention vs. nonintention.  Perhaps a more neutral, technical definition, not immediately connected with a composer could start the music section, followed by a brief list of a few composers and representative works, and a link to the longer article on aleatory music.  Unless there are any objections, I'll do that soon.)  09:16, 1 February