Post-punk is a loosely defined music genre and period that emerged in the late 1970s in the wake of punk rock. The concept was originally outlined by Jon Savage in his "New Musick" editorial for Sounds magazine in November 1977. The term has been noted for lacking a universally agreed-upon definition. Post-punk musicians departed from punk's fundamental elements and raw simplicity, adopting instead a broader, more experimental approach that incorporated a variety of avant-garde sensibilities and non-rock influences. Inspired by punk's energy and DIY ethic but determined to move beyond rock clichés, artists drew influence from German krautrock and experimented with styles such as funk, electronic music, jazz, and dance music; the production techniques of dub and disco; and ideas from modernist art, cinema, literature, and politics. They also established independent record labels, created visual art, staged multimedia performances, and produced fanzines. Among the early post-punk bands, only Siouxsie and the Banshees and Public Image Ltd. achieved commercial success in 1978, with debut singles reaching the top ten of the UK Chart.