William Earl Ben Gibbard was at the height of his powers in 2003, delivering the two records his entire output is measured against: Death Cab for Cutie’s fourth album, “Transatlanticism,” and the Postal Service’s sole LP, “Give Up.” Although Gibbard is the frontman for both groups, the bands’ sounds are miles apart. DCFC started as a modest Washington-based rock outfit with a sound that developed from Built to Spill-esque indie to more sweeping, experimental studio rock, with the yearning long-distance relationship lyrics of “Transatlanticism” perfectly matching the sweeping guitars and tasteful drumming.