Lyrics:

Lights out, the fun begins.
Can't sleep when I'm listening in.
Under cover, that sound -
My connection to the underground.
Underground...
My connection to the underground.

Transistor, tiny spark.
A bigger, better world in the dark.
Under cover, I found
My connection to the underground.
Underground...
My connection to the underground.

A secret signal from a Starman -
Just a string and a tin can.
It turned my everything right around;
My connection to the underground.
Underground...
My connection to the undergound.