Never again would birds' song be the same.
This poem is about a man who has fallen out of love and thus he is seeing the world with a broken heart. He talks about Eve who comes to the garden and changes the songs of birds. The speaker is parallel to these birds as he too has fallen under the spell of Eve. He describes how she barely does anything and so her subtlety only effects the birds, but if in fact it was so subtle he wouldnt have noticed. The last line is the most interesting, "never again would birds' song be the same. And to do that to birds was why she came" This again is parallel to how eve effects the lives of men yet it gives a possible reason for her mischief. This could be an insight into the vanity of women that they can go about making things fall in love with them just to satisfy some self insecurity.
The pattern of the poem is that of an english sonnet, the turn occurs at line 9. The poem switches from describing how eve (which is a symbol for love) effects the birds to showing why she does this.