Overview
"A Nightingale Sang in Berkeley Square" is a British romantic popular song written in 1939 and published in 1940, with lyrics by Eric Maschwitz and music by Manning Sherwin.
Setting
Berkeley Square is a large leafy square in Mayfair, a part of London. The Ritz Hotel referred to is just outside Mayfair, adjacent to Green Park.
That certain night, the night we met,
There was magic abroad in the air,
There were angels dining at the Ritz
And a nightingale sang in Berkeley Square.
The nightingale, a migrant songbird, is celebrated in literature and music for the beauty of its song. It favours rural habitats, and is unlikely to be heard in Central London.
From Wikipedia (CC BY-SA 4.0).