It's from the episode Skin. The one you download from Itunes.
It took me a while, but I finally discerned some of the lyrics...
"... in the heat of conflict
They can seem to hear it all
Hey it has the smell of sickness
Say somebody got ..."
Then as it goes to the chorus it sounds like,
"Words carry...."
Then there's some vocalizing with the words.
Thanks to everyone who answers!