What's needed is a new topic thread. The moderators could add Classical Music 101 for Beginners!
If knowing what composers to start with, this list of the most popular from Arkivmusic pretty much is spot on. There is no one on the list who doesn't deserve to be, and I can't think of one who isn't there who should be. Not even Boulez.:devil:
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I don't like that title! It implies (to me, at least) that we gracious experts are spelling out the basics for you newbies.
'Building a Library' is better, I think, because it's something we all do (well, those of us that actually own music rather than just streaming it, at least), even as we get extremely old, and no matter how clever we think ourselves

It also has a positive connotation of achieving something, not a negative one of having to be taught the basics.
I don't like your list of composers either. There's one very obvious and glaring omission, right from the get-go. Under the Bs.

Which is not to say it's not a reasonable start, but it's hardly comprehensive.
I also was imaginging that the list of who to include might more depend on what composers members here wanted to share with people. If someone has a mad-keen enthusiasm for, say, Villa-Lobos, they should be free to advance a 'core' for him, whether he's on the list or not.
That said, the entire idea seems to have been rained on from a great height by people who clearly managed to work it all out for themselves without any guides or shortcuts from anyone in their lives. So I suspect the idea's dead in the water before it starts.
Which is a shame, because I'm enjoying more Charles Ives this morning, precisely because of someone's enthusiasm for him, phrased in the form of a short checklist of works, in this very thread.