90 Day Men

Chicago school refers to a mid‑to‑late 1990s post‑rock movement centered in Chicago whose artists fused jazz sensibilities, minimalist repetition, and studio experimentation into an understated, largely instrumental sound. Albums typically feature interlocking percussion (often including vibraphone and marimba), dub‑style bass and mixing techniques, clean guitars, and subtle electronics. Rather than spotlighting solos, arrangements emphasize texture, groove, and ensemble interplay. Labels such as Thrill Jockey, Drag City, and Touch and Go served as hubs, and personnel frequently overlapped across groups, giving the scene a collaborative, modular character.

Math rock is a subgenre of indie and experimental rock defined by complex, irregular rhythms, sudden dynamic shifts, and angular, interlocking guitar lines. It frequently employs odd and mixed meters (such as 5/4, 7/8, 11/8), polyrhythms, start–stop figures, and intricate syncopation. Guitars often favor clean or lightly overdriven tones, tapping, and harmonically adventurous voicings over traditional power-chord riffing. Vocals, if present, are usually sparse, textural, or rhythmically coordinated with the ensemble rather than the primary focal point. Aesthetically, math rock draws from the precision and structural ambition of progressive rock, the urgency of post-hardcore, and the textural curiosity of indie and noise rock, resulting in music that feels both cerebral and visceral.

Post-hardcore is a branch of hardcore punk that retains the style’s urgency and DIY ethos while expanding its musical vocabulary. Bands push beyond breakneck tempos and simple power-chord progressions into more dynamic song structures, varied rhythms, and a wider emotional range. Guitars often alternate between caustic distortion and clean, chiming textures; vocals can shift from shouted slogans to melodic singing; and arrangements emphasize tension-and-release, odd meters, and dramatic builds. Lyrically, post-hardcore tends to be more introspective and socially conscious than its hardcore roots, touching on personal, political, and philosophical themes.