This answer started life with only material copied from a Reddit thread, though the user did provide a link to the original material. Then a second section was added in the form of a long (by the standards of Stack Exchange answers) essay that feels meandering in the context of the question. This material is also copied in its entirety from an external site, also with a link to the original.
This answer seems to provide a shallow survey of the history of music and a rant about why the public no longer cares about classical music, with none of the material generated by the user who posted the answer. Further, it isn't clear to me that this post is an actual answer to the OP's question, which was: Why aren't there composers writing in a classical style today? Obviously the OP question rested on a false premise: there are many composers working in classical styles today, a fact pointed to by many of the other answers to this question.
This answer does not seem to me like a suitable answer for this site, but I am not sure how it should be flagged. I don't think that it actually answers the question, but I do think that it is an attempt at an answer, so probably it should not be flagged as NAA. It isn't plagiarism, since the material is attributed. But there is no original content from the answerer here, and it is difficult to see what the answerer is trying to say with all of this (other people's) verbiage.
Maybe this calls for a custom moderator flag?
EDIT: Bumping this question in the interest of further discussion on the general issue. (The specific post that prompted the question has been attended to.)