xTHE SINGER

Audrey was a talented singer, but not considered well enough in My Fair Lady, where her singing was dubbed by Marni Nixon, despite Audrey's preparations for the role. But her real voice is heard during the first verse of one of the songs in the movie. "Just You Wait, Henry Higgins".
In Breakfast at Tiffany's she performed Moon River, and in Funny Face she sang in six songs,

Lyrics
Sabrina
Funny Face
Breakfast At Tiffany's
My Fair Lady