"N" in Literature by HensleyB

Question 10

What five-word phrase fills the blank in this stanza from William Butler Yeats's "Sailing to Byzantium"?

That is ___. 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 unageing intellect.

No Country for Old Men