At times over the past few years, as his fretboard confessional songs vaulted from their Omaha heartland and began landing him on world stages alongside such figures as Bruce Springsteen, it seemed like the weight of responsibility would crack open the fissure line in Oberst's trembling voice and he would crumble apart, another brilliant, doomed rock-'n'-roll angel (R.I.P. Kurt Cobain, Jeff Buckley, E