"old classic song feeling without a lot of people actually knowing it ."= "song that's not hugely well known, but which sounds familiar"

They are similar but not the exact same like you and others have suggested already.

Your addition to what Brooker said didn't add anything different to the what initial OP said.

Yes it did. The OP didn't say anything about it being "haunting and beautiful" like Brooker did. So, again, like I've already said half a dozen times, the initial OP was close but not quite. I was adding more detail to their statement, not saying they were wrong. I literally said that what they said was close. So again, I don't see what was condescending about my post.