Certain music is sometimes described as "dark" in a metaphorical sense. For example, "dark pop" is often indiscriminately applied to a wide range of disparate artists, but usually refers to popular music that incorporates synthesizers or a minor key. In Germany, the term schwarze Szene ("black scene") has been "used since the 1990s to describe all the so called dark alternative music styles swirling around Goth: industrial, darkwave, electro, metal, neofolk and medieval, including BDSM/fetish culture".