“Mon amie la rose” (“My friend, the rose”) is a wonderful French song performed by Françoise Hardy and written by Cécile Caulier, released in 1964 :
A scoop neckline is medium low in front, rounded and wider than the base of the neck. Brocke dress and Marchesa dress. Source : https://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/24654/ECNO1382.pdf?sequence=1
A boat neckline or bateau neckline is “a wide neckline that runs horizontally, front and back, almost to the shoulder points, across the collarbone”. It is an elegant, feminine and retro type of neckline. In the fifties, the boat neckline dresses were very popular. Paule Ka’s dress Source : http://www.stylishwife.com/2015/04/neckline-fashion-vocabulary-learn-to-decipher-it.html