I am not sure there is anything special about the nightingale, apart from its magnificent song, but when trying to think of a bird beginning with the letter N, I remembered when I was a child there was a very popular song "A Nightingale Sang in Berkley Square. It was during the war years (WW2) and Vera Lynn sang the song beautifully. I feel that love songs are so important to everyone in war time.
Others have done justice to the song as well, including Frank Sinatra.
The Common Nightingale or simply Nightingale (Luscinia megarhynchos) also known as Rufous Nightingale, is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World Flycatcher, Muscicapidae. It belongs to a group of more terrestrial species, often called chats.
Nightingales are named so as they frequently sing at night as well as during the day. The name has been used for well over 1,000 years, being highly recognisable even in its Anglo-Saxon form - "nightingale". It means "night songstress". Early writers assumed the female sang when it is in fact the male. The song is loud, with an impressive range of whistles, trills and gurgles. Its song is particularly noticeable at night because few other birds are singing. This is why its name includes 'night' in several languages. Only unpaired males sing regularly at night, and nocturnal song is likely to serve to attract a mate. Singing at dawn, during the hour before sunrise, is assumed to be important in defending the bird's territory. Nightingales sing even more loudly in urban or near-urban developments, in order to overcome the background noise. The most characteristic feature of the song is a loud whistling crescendo, absent from the song of the Thrush Nightingale. It has a frog-like alarm call.
You can listen to the "Song of the Nightingale" by popping those words into Google. I thought it was rather nice and yet I felt our canary had a better song but perhaps I am prejudiced. I did ask Phil if he remembered hearing nightingales singing when he lived in England. He said he had heard them but it is now over 53 years and he remembers the song of our canary much better so I didn't get very far there. The nightingale has been associated with romance over the centuries so it certainly must have something that inspires poets and the like. I thought the following quite interesting. I've not heard this music but would dearly love to do so. Once again it seems the nightingale has been an inspiration.