Black Flag's sound mixed the raw simplicity of the Ramones with atonal guitar solos and, in later years, frequent tempo shifts. The lyrics were written mostly by Ginn, and like other punk bands of the late 1970s and early 1980s, Black Flag voiced an anti-authoritarian and nonconformist message, in songs punctuated with descriptions of social isolation, neurosis, poverty, and paranoia. These themes were explored further when Henry Rollins joined the band as lead singer in 1981. Most of the band's material was released on Ginn's independent record label SST Records.