And to Do That to Birds

Yesterday's mention and video of birdsong caused me to remember, of course, my favorite Robert Frost poem:

He would declare and could himself believe
That the birds there in all the garden round
From having heard the daylong voice of Eve
Had added to their own an oversound,
Her tone of meaning but without the words.
Admittedly an eloquence so soft
Could only have had an influence on birds
When call or laughter carried it aloft.
Be that as may be, she was in their song.
Moreover her voice upon their voices crossed
Had now persisted in the woods so long
That probably it never would be lost.
Never again would birds' song be the same.
And to do that to birds was why she came.

For many years I would print my own cards to put on wedding gifts for friends. I would use this poem in the card for the bride, but never found a satisfactory matching poem for the groom. Any ideas?