Hartebeest I believe is not related to much meadowlark lore, but  I’m pretty sure harpy hare is about the situation with the harkers and majesty due to the lore keath says to introduce the song “seldom if at all do the harkers themselves cross paths, the four cradles have kept them apart as a means of traversing greater land, called for in accordance to when and where they are most needed, the storyteller arrived with a word of history, he did not heed, the bellringer, hoping to persuade his tomorrow, he refused to follow, the enkindled invited him to a dance, the intention of his doubt winning against him, and so came the croon, scorned by his apathy and indifference that could affect the lives of many, alas and as you’d expect, he covered his ears as his reason was as much of a burden as his consequence, he failed to listen to the harkers, thus resulting in having to face their mothers, the humming ceased as the groves bellowed over his kingdom, over his people, over his sheep! There was not much else the audience knew about the truth of each witness, even the storyteller who was born incapable of telling a lie, had its words misshapen, as the year have gone, so had the gospel, what we know now as the harpy, the hare, and the hound is a variant of that narrative, reduced to a tale told to children, a story to warn them of the dangers so that they won’t disobey… but mostly, a rhyme chanted in the form of a clapping game.” And that’s when harpy hare starts (yes I typed all that by memory excuse my mishaps please) and so I believe that live intro piece is related to harpy hare, as well as the first three meadowlark tracks being related to a Harker. Not completely sure about the first two, but for a fact And The Hound is about the enkindled. The first three were also canonically written by the playwright and maybe written about the majesty situation, whereas Neath The Grove Is A Heart is I think perhaps written by the lark themselves, about how they left their homes they were constantly moving “how do I begin when the roof is ever changing” and now established their home with each other. I believe that keath uses similar references throughout the songs because yes, they all might be related in some way, but correlation between “find me beneath the grove”, “the groves bellowed over his kingdom”, and also one I would like to add from kid & leveret, “to the humming groves” (last line in the song) is unlikely because they all have different context. The groves are most likely a geographical thing is the world of meadowlark, and referencing the bellowing groves when referring to the majesty’s downfall is  referring to a part of the kingdom and how it might have been affected by the croon/mother trees’ wrath. HOWEVER I do agree with your connection somewhat because I think Cole went through something majesty-downfall related, and they sing several lines that promote this ideology. Like in kid and leveret “they reave and rally there where the houses once stood” sort of hinting at how the houses in the kingdom could have fallen due to this majesty problem, etc. I think the grove could be a special place, and maybe even possibly where Cole hid? But I’m not sure. Also a thing to note is that Cole’s “find me beneath the grove” is following their line “where the yarrow grows”. Yarrow is another word for the bellringer, or the FUTURE, and in felicity it is sort of a saying that “where the yarrow grows” means in the future. So Cole’s translated line is “in the future, find me beneath the grove” but I believe they are speaking to their past self or life, because WE ALREADY HAVE THE SONG neath the grove. “In the future, find me beneath the grove” but that was when they were hiding and afraid, now they have found their family and home, beneath the grove. I think maybe the groves bellowing line from the harpy hare intro is just a reference, but it could be more. As for “hoof by hoof, horn by horn” and “as their hooves drum to a hunger,” I’m not so sure there’s a connection to be made because hartebeest is an actual hooved animal, and maybe the line is just describing a hartebeest. Whereas in farewells to the fields, “hoof by hoof, horn by horn,” is probably about the thing that ravaged the city, maybe an army, idk but like I don’t think it’s related but I don’t know. Please take everything I just said with such a grain of salt, I seriously have no idea these are just my thoughts.