"Making Up for Lost Time" is an orchestral piece on the Season 5 soundtrack. It's the season's first released track.
In a hotel room, Jack asks Ben the last time he saw Locke. He claims they last met in the Orchid, and we see a clip of their meeting there. Jack then says it was thoughts of those they left behind that convinced him to return to the island, and we see a clip of Sawyer and Juliet staring at the freighter's remains.