The album's instrumental background was provided by the legendary Muscle Shoals team.
During the road scenes a soundtrack that suggests the instrumental background for a Bruce Springsteen ballad supplies a nervous electricity.
By accident both tracks were played back simultaneously on the instrumental background, and the producer suggested that both vocal tracks should be used on the album.
It can be particularly effective in providing an instrumental background to the spoken word, in drama, readings or prayers.
Of the original 14 Rodgers and Hart songs, eight remained, but with two as instrumental background, and four songs were added from other shows.
The song is built around an instrumental background and also includes a male voice speaking various lines.
As well as toasting, the "dubbing" of poetry to an instrumental background became popular in the late 1970s to early 1980s.
The track consisted of six 90 second blocks of music, with instrumental backgrounds.
As long ago as the late 30's, Victor was re-releasing Caruso arias with new instrumental backgrounds.
It certainly made sense for the installer to have an instrumental background.