Philadelphia entered the 1990s in crisis, and came out of them with a sound of its own.
The city recorded its worst year for homicides in 1990, at the height of the crack era. Factory jobs had been leaving for decades.
The decade's quiet engine was a public school. At the High School for the Creative and Performing Arts, Boyz II Men formed in 1985 and Ahmir "Questlove" Thompson met Tariq "Black Thought" Trotter in 1987. The band they started on the sidewalk gave the city a nickname that stuck: Illadelph.
Radio, mixtapes and a few small rooms carried the rest: Power 99's Radioactive, tapes sold hand to hand, and the open mics and jam sessions where Jill Scott, Musiq Soulchild and Bilal came up.