I was hoping for a multiplicity of voices; it consoles me, because it at least partially justifies the fact that we are not convinced by the uniqueness of any of the possible classifications. Therefore, for now, thank you. I will take a couple of your statements here and there to reflect on and tell you what I think, so we can compare notes.
I'll start with CromaDiBrera, who says it is a point of view that excludes judgments of merit regarding various genres, and says they agree; indeed, my definition was heading in exactly that direction, namely, if it is "well-written music" it can be a symphony or a commercial jingle, but if it is well-written, it is well-written. At this point I will supplement, borrowing from Valchiria, who says that it either works or it doesn't: exactly! This allows us to avoid like the plague different judgments that would bring into play the legitimacy or lack thereof of a certain type of music compared to another. So, naturally, even though I understood what Piccinesco meant when stating that a piece can be technically well-written (therefore at a theoretical level) but sound bad, in reality for "well-written" I would mean well-written "tout court," meaning that, besides being correct, it sounds good, etc. (I'll open a parenthesis regarding my classification from a while ago, which I didn't remember, when I said that Piccinesco's music "made no sense"; well, aside from the fact that I hope I at least justified such a slap, in this case, probably, one of the elements that could make me say it was "well-written" was missing. Parenthesis closed, with apologies for my sometimes overly blunt frankness...).
I do not feel like embracing Xenakis's choice when they say it wouldn't be bad to also meditate on the "shareable" and "unshareable," because this definitely puts objectivity in the cellar and brings subjective evaluations into the field, with many implications, certainly, but very far from being as objective as possible. For example, I could say that I do not share (perhaps for ethical reasons?) Ushikawa's music, but this would not automatically mean that it is "badly written" music, nor that Ushikawa is a poor composer.
Thallo says that, if they can, they implement different classifications like "music I like - music I don't like," and understandably so, but this type of classification is precisely what I thought to avoid when trying to establish the validity of the one in question. However, naturally, it is a classification we all make, despite it being the furthest from objectivity of them all. When you say there are well-written things that I don't like (you see all of Massenet) and badly written things that I do like (you see the themes of some cartoons), you are combining two evaluation criteria. To put it this way (since I know you are sensitive to the subject), there are well-cooked dishes that I don't like (like "I-don't-know-what") and badly cooked dishes that I do like (like McDonald's hamburgers): we are combining a technical judgment with a subjective one. No one can say that McDonald's does haute cuisine. That doesn't stop anyone from gorging themselves on that stuff... While I don't think you hit the mark (at least regarding the meaning I give to the proposed assumption), when you say that in the definition "well-written music and badly written music" you see a judgment, not only of aesthetic value but of ethical value, at least latently, because it is anything but that. Schönberg's «Musikbegleitung für eine lichtspielszene» is a very well-written piece. The fact that it is liked or not (and it absolutely horrifies me) does not change the fact that I find it a piece written with absolutely astounding mastery. Therefore, no aesthetic judgment, let alone an ethical one. The ethical judgment lies more in Xenakis's "shareable"/"unshareable," so, as I said above, it is far from my goal, which is to identify the possibility of being as objective as possible (provided that is possible, of course).
Dafterward, I will close by borrowing one last statement from Thallo, which I share and which was, as far as I am concerned, implied: namely, if one wants to be technical, one must strive to be precise (the piece is badly written because...), to circumscribe the field (the piece is badly written if we take [this] as the reference landscape). I repeat: I agree. This is the exact purpose of the statement. What I mean is: is it possible to state that Shostakovich's Seventh Symphony and «Sgt. Pepper's Lonely Hearts Club Band» are two "well-written tracks"? In my opinion, yes, and this is only possible because 1) we avoid giving an aesthetic judgment, 2) we avoid emphasizing our preference for one or the other of the two tracks or musical genres, 3) we place each of the two tracks in its respective order of belonging and, based on that, establish that they are well-written.
I look forward to hearing from you. Until next time, if you wish.