Reginald Shepherd has published a brief but powerful reading of Wilfred Owen's "Dulce et Decorum Est" on his blog.
I read the poem in high school, and when I think back on it now, it was one of the first poems that showed me what a poem could do and be. Such memorable phrases and lines, too:
Gas! GAS! Quick, boys!—an ecstasy of fumbling
His hanging face, like a devil's sick of sin