The tune is an original piece called "Gunfight Epiphany," written and performed by Terriers score composer Robert Duncan, who also wrote the opening title themes for Terriers producer Shawn Ryan's previous show The Unit and Castle (as well as the music during a hilarious score-related gag from Castle's first season). The iTunes Store released an extended version of "Gunfight Epiphany" today. (An A.V. Club commenter who prefers the Terriers theme's earlier title "Steel Neena" remarked that "Gunfight Epiphany" makes it sound like a Mars Volta B-side.)
As a fan of The Rockford Files and Veronica Mars, I've been loving the hell out of this show, a superb beach noir in the vein of Rockford and Mars. Like those two shows, Terriers skillfully balances smart-ass humor with pathos and to borrow the words of Vulture's Emily Nussbaum, "takes its characters' moral lives seriously, without ever being pompous." The creation of Ocean's Eleven and Matchstick Men screenwriter Ted Griffin, Terriers is also the sole gem in what has been an unexceptional fall TV season.
Unfortunately, Terriers has been doing so poorly ratings-wise (Mars had this problem too--why is the P.I. genre ratings Kryptonite?) that Logue and Raymond-James have embarked on a cross-country tour to spread the word about their show and host episode screenings for college campus audiences. As a show of support for Terriers, I'm adding "Gunfight Epiphany" to daily "Assorted Fistful" rotation on A Fistful of Soundtracks.
Oh, and watch Terriers Wednesday nights at