 It was frequently instrumental, serving as the "soundtrack" for tropical excursions.Exotica and lounge were more prominent in the 1950s and later, although new variations of hapa-haole would also continue.Traditional Hawaiian melodies, sometimes called "Hula Music" at the time by mainstream Americans, initially became prominent in piano sheet music and also created a dancing fad and obsession with Hula girls swaying to the music of strummed ukuleles.