There have been "la la la"s and nonsense lyrics in music since ... well, since a long time back. Why, who could forget that sixteenth-century classic "Nos Galan"? And Nigunim have been part of Jewish tradition since at least the early 1700s. And Svara has been around for a couple of thousand years or so.
But do scat and Doo-Wop-style syllablizations (if I may coin a term) find their origins in earlier traditions, or are they distinct unto themselves? Where do they come from?
And for anyone unfamiliar with the song quoted in the title: