I thought the French refer to art song as Melodie, whereas Chanson just means a song. Actually, in German, I believe, lied just means 'song' (and lieder is of course plural). Kunstlied if you wanna be a fop.On this illiterate side of the pond, and probably having easily caved in to the Hegemony of the German Music Cartel of the time, Lieder is used generally for "art song." Most of the population doesn't have a clue it is plural, either.
In Britain, its a Song.
In France, its a Chanson.
In Italy, its a Canzone etc.
Classical, the classical era / classical, all classical eras -- God help you if you want the general term and are starting a sentece with the word