I'm as bad as Peter, bombarding the list with short squibs. My
apologies. 

If any one poem 'ushers in' modernism, it would probably be Pound's
"Near Periogord," the third section of which self-consciously &
explicitly 'gives up' on 'solving' the mystery de Born's poem presents
by seeing that poem itself as baffled before the same mystery. Section 1
sort of strait fictional narrative , imagining a medieval conversation,
the second section an imitation of Browning, and the third section
something rather radically new. And he saw TWL (or the buried TWL) as
like that making a form of its own bafflement.

That isn't quite it, but if you look at Pound's poem in this way and TWL
through it it may be suggestive.

Carrol