In 1989 the Geto Boys released a blistering track, "Size Ain't Shit," that paid tribute to the group's member Bushwick Bill. Born with dwarfism, Bill was one of the few visibly disabled musicians to achieve widespread fame and one of the even fewer to address disability in a direct, sustained manner. Initially hired as a dancer, Bill became central to the Geto Boys as the Houston crew became one of hip-hop's most important groups. Why Bushwick Bill...