For sounds in winter nights, and often in winter days, I heard the forlorn but melodious note of a hooting owl indefinitely far; such a sound as the frozen earth would yield if struck with a suitable plectrum, the verylingua vernaculaof Walden Wood, and quite familiar to me at last, though I never saw the bird while it was making it. I seldom opened my door in a winter evening without hearing it;Hoo hoo hoo, hoorer, hoo,sounded sonorously, and the first three syllables accented somewhat likehow der do; or sometimeshoo hooonly.
He compares the hooting of an owl to music. It's shown here how much of a close listener he is. It seems like he enjoyed winter nights and looked forward to hearing the owls