The late 1980s and early 1990s saw the formation and rise to prominence of several bands associated with earlier acts that not only included the examples of Fugazi and Shellac, but also Girls Against Boys (originally a side-project of Brendan Canty and Eli Janney, which would later incorporate members of Soulside), The Jesus Lizard (formed by ex-members of Scratch Acid), Quicksand (fronted by former Youth of Today and Gorilla Biscuits member Walter Schreifels), Rollins Band (led by former Black Flag singer Henry Rollins), Tar (which raised from the ashes of a hardcore outfit named Blatant Dissent), and Slint (containing members of Squirrel Bait). Acts such as Shellac and Louisville's Slint have been considered as influential to the development of the genre of math rock, with the former featuring "awkward time signatures and trademark aggression" that has come to characterize "a certain slant" on math rock, while the latter presented "instrumental music seeped in dramatic tension but set to rigid systems of solid-structured guitar patterns and percussive repetition". According to reviewer Jason Arkeny, Slint's "deft, extremist manipulations of volume, tempo, and structure cast them as clear progenitors of the post-rock movement".