First, a disclaimer: I'm not particularly receptive to poetry, I don't read it often, and I'm largely ignorant of most of that there is. But, very occasionally, I feel a need to dive into it, either looking for inspiration, or because I've read something else that has pointed me there.
Obviously, I have not read all the contents of this book. It's a thousand pages long anthology! I imagine it must be the most comprehensive of all. The contents are divided into nine wide-ranging sections in a not too exact chronological order. Poems are separated from songs, though the editor admits that the boundaries between them are porous. There are translations from Latin and Irish as well as works originally written in English (including Middle English).
Just skimming through this immense collection took me several days. I've properly read perhaps one twentieth of what there is, or maybe even less, but it was enough to reassure me in the belief I share with quite many others that the Irish are generally damn good at poetry.
That is not to say that I loved every bit of it. As I said earlier, I'm not really that much into poetry. Especially not contemporary poetry, with the exception of Seamus Heaney. But there was one piece that I would like to mention especially, because it rang very strong with me. It's a famous poem by W. B. Yeats - I knew of its existence but never read it until now - 'Easter 1916'. Its the kind of poetry that leaves one's heart hammered.