Schoolly-D (often cataloged as S/T or self-titled) is the 1985 debut studio album by Philadelphia hip-hop pioneer Schoolly D. Co-produced alongside his DJ, DJ Code Money, and originally self-released on his independent imprint Schoolly-D Records, this record is widely considered the foundation of gangsta rap. Powered by the raw, booming minimalist crunch of the Roland TR-909 drum machine, its stripped-down production fundamentally influenced legendary acts like Ice-T, Public Enemy, and the Beastie Boys.