Chicago's 90 Day Men evolved into one of the more distinctive math rock bands of the early 2000s, adding elements of psychedelia, '70s prog rock, and new wave to the angular, dissonant complexity that was the genre's stock-in-trade. Early on, their sound was a ragged post-hardcore art-punk indebted to Slint and their various Louisville brethren (Rodan, June of 44, etc.) as well as D.C.'s Dischord stable. As keyboards became an increasingly important part of their approach, however, they shifted into a more accessible, jam-friendly style, wrapping prominent piano melodies in dr...