The National counted down the final hours before the release today of their new album with a performance last night on the Late Show With David Letterman. Singer Matt Berninger hunched over the microphone to deliver the lyrics on "Don't Swallow the Cap," and swirls of strings, guitars and keyboards enveloped his baritone voice while Bryan Devendorf anchored the song with precise, subtle rhythm on drums. "Don't Swallow the Cap" comes from Trouble Will Find Me, the National's sixth LP.