100,000 modes analogous to our music instruments.  Harmony is universal code of spirit communication.  Morontia functions often executed in rhythm.  Spirit melodies are not material sound waves. 
Expresses tempo of emotions.  Flute played at mourning.  Form of mathematical rhythm.  Gift of harmony occurs only once in 1000 mortals.  Harmony and rhythm spiritually akin to beauty.  Involves exertion of higher intellectual powers.  Jesus loved harp.  Limited range of mortal hearing.  Majority react to music with material muscles.  Military trained in music in continental nation.  Real musician could change course of a nation.