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.

Reggae, oh man. It's the ultimate music. The positivity. The musicality. The whole cultural expressionism of it. The danceability. Just the cool factor. The melody factor. Some of it comes from a religious place. If there were a competition of who makes the best religious music, it would definitely be the Rastafarian reggae.”
Lupe Fiasco