But post-metal and post-rock are still obviously metal and rock. They both still follow the stylisations of their parent genres but place emphasis on particular parts of the music.But remember the literal interperatation of "post" is "after", so while rock and metal have been lucky enough to get something clearly defined, other post-genres might not be so lucky.
This is where I disagree, what the fuck is it supposed to be "After" is rock finished is it done are people not making rock anymore, no, thats why its such a ridduclous tag.
As for the first part of what you said, I don't disagree with this, these "post bands" are obvious taking an existing structure, an existing style and building upon it. It's not a new movement, their not making some hertho unheard of form of music, it's just another sub-genre, this is where the crux of my disagreement with the label "post" stems from.
As Flamming Ostrich stated, he believed
Post-anything refers to bands that took parts of a genre and tried to expand and challenge the sound. I pointed out, which was obviously lost in oversimplification, that progressive music and Advante Garde music also both attempt to do this (expand and challenge an existing set of sounds). As you demonstrated by your knowledge of those two terms both these are apt descriptions of a particular sound. What I was enquiring about is how does "post" fit into this, I honestly don't think it does saying a particular band's sound is "after" genre X in no way describes to me how that band is "expanding and/or challenging" the existing genre's sound.
If someone tells me a particular band plays progessive rock, then I can infer they have some type of arguably innovative sound, which they achieve through reasonable technical proffiency and a strong application of musical theory.
Alternatively if someone informs me band X have an advant garde influence I can assume they will be innovative due to use of non standard (or experimental) sounds or structures in their music.
Yet when I'm told a band plays post rock, I have no idea what the hell they will sound like, the term itself is unhelpful I was seeking clarification on this, until I'm given an adaquate non contradictory discription I'll stick to my belief that the use of the word post when describing a bands sound is ridiculous...