TLFi

Étymol. et Hist. 1933 scat-chorus (Jazz-Tango-Dancing, janv., 21c ds Höfler Anglic.); 1934 style « scat » (Panassié, loc. cit.). Empr. à l'angl.-amér.scat syll. à sonorité expressive utilisée comme subst. pour désigner le style de chant avec de telles syll. (1929, Melody Maker, Apr. 369/I ds NED Suppl.²: This particular type of vocalism is known as ,,Scat`` singing. This name undoubtedly owes its origin to the almost inevitable way of starting any line with ,,Scat-da-doo``. A very fine example of this ,,Scat Singing`` is in ,,Candy Lips`` by Louis Armstrong's Washboard beaters..., the label rightly describing it as ,,Scat`` chorus by Clarence Williams).