Black Flag is an American hardcore punk formed in Hermosa Beach, California. The band was established by Greg Ginn, the guitarist, primary song writer, and sole continuous member through multiple personnel changes in the band. Black Flag's sound mixes the raw simplicity of the Ramones with atonal guitar solos and frequent tempo shifts. The lyrics were written mostly by Ginn, and like other punk rock bands of the late 1970s and early 1980s, Black Flag voiced an anti-authoritarian and non-conformist message. 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 label, SST Records.