Why is a voltage buffer loading my input signal (Audio)?
The LM833 recommended operating voltage is 10V (+/-5V) minimum and you're giving it only 7.5V. 

Also your 200 ohm resistors are WAY too low, and are loading the output of the op-amp (100 ohm equivalent load). Try 4.7K or so each. That means  you can also decrease C2 proportionally.