Ruler of Servitude

I am calm and collected
-I am fiery and impulsive
I am organized and straightforward
-I am chaotic and enigmatic
I am a stationary being
-I am ever moving and changing
I follow all the rules
-I break the laws of classic conduct
I am paid when my work is done
-I am the payment for your work
I am always in control
-I am the slave that rules you
I am the musician
-I am the music