"Locke'ing Horns" is an orchestral piece on the Season 4 soundtrack. It plays during the season premiere.
Locke has suggested the survivors go to the Barracks, but Jack has told people to contact their rescuers. Hurley tells the survivors that Charlie died trying to rescue them, and that his last message warned them against trusting their rescuers. He decides to go with Locke, and several survivors follow him.