Public Image Ltd (abbreviated as PiL) are an English post-punk band formed by singer John Lydon, guitarist Keith Levene, bassist Jah Wobble, and drummer Jim Walker. The group's personnel has changed frequently over the years; Lydon has been the sole constant member. Following his departure from the Sex Pistols in January 1978, Lydon sought a more experimental "anti-rock" project and formed PiL. That year PiL released their debut First Issue (1978), creating an abrasive, bass-heavy sound that drew on dub, noise, progressive rock and disco.