There was a discussion in an earlier part of the series, for which I came too late to participate, about form constraints in composition. I saw a few people argue, basically, that "let sounds be free!".

I thought that was a silly discussion (sorry). With absolutely no constraints, there would be no styles, and in fact no music. Music is about recognising some patterns in sound, so there will always be some constraint in there. Furthermore, creativity can get further if operating with a lesser number of variables - and the constraints of styles provide for that. Even musical rebels only kick a few of the prior constraints on form at a time, to get variation in a few more dimensions.

_{*Lunatic*, n.
One whose delusions are out of fashion.}