The guitars' sound and Mr. Martens's never-dull work bridge the various tracks, but Mr. Merritt will sing one song in falsetto, another with a Cookie Monster belch, and yet another with throaty rawness.
Callery, who won three Emmys for his work on Fox's "24, " noted that "Homeland" die-hards will notice that the theme song has been varied ever so slightly for season two.