I'm kind of a poetry nerd. (You are not shocked.) Accordingly, I love reading prose by poets on poetry, interviews, book reviews, whatever. It's something about the way a poet can use a sentence that always gets me, and also (of course) something about the way a particularly insightful poet can illuminate all of the invisible (but moving) gears inside the poem machine.
The Sighted Singer takes two approaches to the aforementioned: the first half contains conversations between Grossman and Halliday, while the second part encompasses Grossman's take on (and I'm totally not kidding here) every major technique of lyrical poetry. Hey, he doesn't call it the Summa Lyrica for no damn reason. Kind of like reading a Taoist Heidegger on the work of the line as it applies to eternity. And the conversations, of course, read like really meaty interviews (or interviews in which both participants are interviewing each other, which it occurs to me is a kind of silly thing to say given that conversations are like that usually, unless you're talking with an Interruptor and then it all goes to hell).