Led Zeppelin has granted permission for two of its songs to be featured in next week\'s episode of the American drama series \"Revolution,\" NBC said. The classic tracks \"Kashmir\" and \"Since I\'ve Been Loving You\" will appear in the episode to air Monday, the same day the band\'s live concert film and album \"Celebration Day\" are released, the network said. \"Anyone who really knows me knows how obsessed I am with Led Zeppelin. So the fact that the band agreed to put two songs in my show is, very seriously, a career high-point,\" Eric Kripke, creator and executive producer of \"Revolution,\" said in a statement. The show is set in the United States after all electric power stops working.