Although rhythmic song will not necessarily elicit obvious motor responses in all subjects, the wide-spread use of work songs among groups of people engaged at hard work on land or sea throughout the world is indicative of the value of background rhythm for communal effort. Mursell[60] believes that “any notion that pure or ‘naked’ rhythm is more effective than rhythm clothed in tone is open to very serious doubt.” But the chief effect of marked rhythm is the feeling of excitement and happiness which it can arouse. Rhythm gives us a certain pleasure because of its orderliness to which the mind is sensible. _Melody_ as a musical element contributes chiefly to restfulness.[71] If it is simple and recognizable it will recall other times and rest the mind from the thoughts of present problems. If it is complex and new it will distract the more musical but have a less desirable effect on the uninterested. _Mode._ The term _mode_ is applied to the arrangement of whole and half-tones in the musical scale construction. Of the many possible modes only two are used in our present system of music, the _major_ and the _minor_. There is only one form of the major mode, and it is the one most people recall when they think of the scale. There are three forms of the minor mode, but of these the _harmonic_ is the most frequently used. It is formed by lowering the third and sixth notes by a half-tone.[80] When an author pioneers convincingly in a field which has long needed clarification, it is likely that even his questionable remarks will be accepted with the same degree of authority as his scientific statements. In 1722, Rameau[68] published a treatise on harmony which received wide acceptance because of its excellence and comprehension, but in that work he prejudiced many of the writers who followed into believing that the major triad was more pleasing and beautiful than the minor. This concept was not only adopted but embroidered. Hauptman[44] likened the minor triad to the branches of the weeping willow and hence attributed to it a mournful downward drawing power. To the major triad he assigned the property of an upward driving force. (When this is taken literally, as it was, and applied to the patient, we can see clearly why remarkable attributes were claimed for music.) Now there is little doubt that if the triad of C minor is struck on a piano after that of C major, most people will describe the sensation elicited by the sound of the minor chord as melancholy. Helmholtz[46] attributed the veiled or sad effect of a minor chord to certain notes foreign to the chord which physical reasoning expects.