Conventional wisdom has it that boredom is of two main types. The first occurs when stimuli or circumstances are too simple, as when the gifted child finds herself in a remedial classroom. The second is when sensory input is so complex as to lull the mind into a quasi-vegetative state. This accounts for the general avoidance of subjects like philosophy and math. Musically, these species of boredom are embodied in the overly simplistic pop song on the one hand, and the overly orchestrated concert work on the other. The former is boring because it poses no challenges and offers no surprises. The latter is boring because its multitude of interacting tones and timbres require more concentration than most are willing to dedicate. In this binary view, the culprits reside at the poles: underload and overload.
Via stan stewart