A Nightingale Sang in Berkeley Square  Written in 1929 in France, the song gained great popularity in 1940's recorded by Vera Lynn . It helped Londoners focus on a more pleasant time in London even while the Germans were bombing the city  I have heard many vocal renditions of this fine song but I believe the  live George Shearing-Mel Torme is the finest. Great vocalizing and highly imaginative piano accompaniment 
At the conclusion, Shearing, on the piano, simulates a bird-like trill just like that of the Nightingale. With this performance. there " surely was magic abroad in the air ."


https://youtu.be/CJKjn2OtyH0