Free from impromptu like singing including but not limited to ooooohs, laaaaas, loooooos, woddila's, ooohdilaa's, dooodilas lodi lodi leh's, etc. etc. They are often sang by a background chorus in jazz like melodies. Typical genre's include Broadway show tunes, upbeat jingles of the roaring 20’s and feel good Christmas music.
Check out some serious Knords in Michael Buble's rendition of "Jingle Bells"
by zonkers77 April 12, 2012