Heart, not so heavy as mine

Heart, not so heavy as mine
Wending late home --
As it passed my window
Whistled itself a tune --
A careless snatch -- a ballad -- A ditty of the street --
Yet to my irritated Ear
An Anodyne so sweet --
It was as if a Bobolink
Sauntering this way
Carolled, and paused, and carolled --
Then bubbled slow away!
It was as if a chirping brook
Upon a dusty way --
Set bleeding feet to minuets
Without the knowing why!
Tomorrow, night will come again --
Perhaps, weary and sore --
Ah Bugle! By my window
I pray you pass once more.