When we consider the previous thoughts around there being a ‘Song of the Soul’, the concept that the rhythm or hum could be interfered with, or hijacked if you will, comes into play.  When that happens, one definition could be an explanation of what happens in depression.  When I think of all the maladies one can suffer from, it is most profound to think of an individual being disconnected from their higher self, their soul self.  Of note, little literature on the esoteric side of things warns of the dangers emanating from the dark side, just as if such does not exist.  This is clearly not the case.  There are certain energetic forms that stand by just waiting for the opportunity to interrupt the healthful play of the soul.  It is also important to remember that where there is dark, there is light.  They go hand-in-hand.