Solved! What are the different wires in my headphones and what are their functions?

[Hadfield services]

I am looking to replace my earphone jack as The wires have taken some use and have given up on me.
Im just wondering what wire is what and what they do.
I have a red wire wrapped in copper a black wire on its own, a blue wire wrapped in copper and a black and copper twist.

Thank you

 

[clutchc]

Red and blue are right and left, and the black is common or ground.