This is an audio connection that uses two wires. One wire carries the signal while the other wire is used as the return. This type of connection is particularly vulnerable to noise and interference, particularly with longer cable lengths.

As the two signal leads are not of equal potential difference from the reference ground signal they are considered to be ‘Unbalanced’ with respect to the ground signal.

See Cardoid.

If you are too overwhelmed, then when you sit down and try to write something, it feels forced. There's nothing worse than forced music. I mean, this world has enough of that right now, where it's basically McDonald's making music. 'Everybody needs another hamburger and fries.' Here's a piece of crap that nobody's gonna care about it two years.”
Corey Taylor