A definition of perfect contentment, was expressed in ancient Greek philosophy by Pyrrho, as 'Ataraxia'; a state of freedom from emotional disturbance and anxiety; tranquillity.
The hallowed state of Ataraxia, according to Pyrrho, can only to be achieved by finally accepting the hard but timeless truth, that the only thing we can ever know for certain, is uncertainty! It is only once we have learnt to live with this fact and to cease striving to perceive the impossible, that we can find our inner harmony.
To best attempt to reflect the profundity of this philosophical insight, I used the intensively introspective ancient Greek Dorian Mode; the equivalent intervals as E-E on the white notes of the piano. This mode, misnamed the 'Phrygian' mode during the Middle ages, was also the only musical mode which Plato thought had true moral worth.