When it comes to musical comedy, few do it any better than acoustic-folk duo Flight of the Conchords. Ever since I first heard the sexy slow jam “Business Time” and the hilarious failed theme song for Lord of the Rings, it was obvious that the New Zealanders Bret McKenzie and Jemaine Clements possessed that very elusive skill - the ability to marry well-structured pop and genre exercises with deadpan, back-and-forth skits marinated in pop culture references and everyday observations. Their well-honed act struck the perfect balance between music and humor, the kind of combo that perhaps only Tenacious D’s debut has fully realized before…