Shepherds go whistling on their way
In the spring season of the year;
One watches weather-signs of day;
One of his maid most dear
Dreams; and they do not hear
The birds that sing and sing; they do not see
Wide wealds of blue beyond their windy lea,
Nor blossoms red and white on every tree.

Siegfried Sassoon

http://www.poemhunter.com/poem/arcady-unheeding/