Jeff Tweedy once blazed the trail for the American rock underground's embrace of its country and folk roots, but as the decade drew to a close he also began spearheading the return of classic pop; simply put, what once were fiddles on Wilco records became violins — the same instrument, to be sure, but viewed with a radical shift in perception and meaning. While lacking the sheer breadth and ambition of the previous Being There, Summer Teeth is the most focused Wilco effort yet, honing the lessons of the last record to forge a majestic pop sound almost completely devoid of alt-country elements. The lush string arrangements and gorgeous harmonies of tracks like "She's a Jar" and "Pieholden Suite" suggest nothing less than a landlocked Brian Wilson, while more straightforward rockers like the opening "I Can't Stand It" bear the influence of everything from R&B to psychedelia. Still, for all of the superficial warmth and beauty of the record's arr...