an extremely high soprano note sung in full head voice; derived from Broadway's Kristin Chenoweth's uncanny ability to spontaneously sing such a note with remarkable accuracy
Chanson is distinguished from the rest of French "pop" music by following the rhythm of the French language, rather than that of English, and thus is identifiable as specifically French.
In France today, "chanson" often refers to the work of more popular singers like Jacques Brel, Georges Brassens, Édith Piaf, Barbara, Léo Ferré, etc.