If music is not well integrated with the other elements of the commercial, it may be detrimental. As Grayson (1974) pointed out, music must fit the situation in which it is used, and the wrong music can produce unintended effects. Thus music is similar to other aspects of the commercial such as humor, which distracts the subjects' attention from the main contents of the message if not properly integrated. The result is that subjects have greater difficulty comprehending the main underlying concept, image, or theme that is the aim of the commercial.