Stephen Colbert has been celebrating his “StePhest Colbchella ’012 — Rocktaugustfest” all week. Last night he brought VH1 staple Santigold aboard for a perplexing “gut mouth” versus “face mouth” discussion (Santigold, for what it’s worth, figures she sings from both: “the impulse is from the gut, there’s no thought in it at all.”), and then a three song set on the USS Intrepid stage. She was joined on stage by a troupe of dancers, who Colbert thought might have been raised by wolves. “I feel like they give physical life to the song, and the songs have a little bit of aggression,” she told him, assuring him otherwise. And so, all on stage together, they “gave physical life” to “The Keepers,” the funky and confident new single off of Master Of My Make-Believe. “One tough move, throw your hands up,” she sings, “Say I don’t make no rules, No one even knows I am here.” Santigold’s boat rocks to her own tune, and last night her tune surely rocked Colbert’s boat.