I also really like Yeats. Here's the intro of Sailing to Byzantium with its intro line that inspired the title of Cormac McCarthy's novel:
That is no country for old men. The young
In one another's arms, birds in the trees
---Those dying generations---at their song,
The salmon-falls, the mackerel-crowded seas,
Fish, flesh, or fowl commend all summer long
Whatever is begotten, born, and dies.
Caught in that sensual music all neglect
Monuments of unaging intellect.
And here's the rest:
http://www.poemhunter.com/poem/sailing-to-byzantium/