Both of these songs are sung by Charles Trenet (1913-2001) and both date from the 1940s, though they have been recorded many times since by many artists in many languages, especially the second.
The first is a lovely one called "Que reste-t-il de nos amours?" ("What remains of our love?" The French put the word "amour" in the plural sometimes.) This is major nostalgia for French folks of a certain age. There is a well-known movie by Truffaut, "Baisers Volés" ("stolen kisses") whose title is taken from this song, though the expression way predates the song, of course. The song, in a new version, was the theme music for the movie.
And this one is a really old, old song. You've probably heard several U.S. American versions of it, including Bobby Darin's rendition and a recent obnoxious cruise line commercial, but THIS (says she, drawing herself up in full snob mode) is the original, sung by Charles Trenet. The song was still around when I was a little girl, though we thought of it as "old folks' music." But we knew it.
This is not disco. Or rock 'n roll.