Dark wave, or darkwave, is a music genre that emerged from the new wave and post-punk movement of the late 1970s. Dark wave compositions are largely based on minor key tonality and introspective lyrics and have been perceived as being dark, romantic and bleak, with an undertone of sorrow. Common features include the use of chordophones such as electric and acoustic guitar, violin and piano, as well as electronic instruments such as synthesizer, sampler and drum machine. Like new wave, dark wave is not considered an "unified genre but rather an umbrella term" that encompasses a variety of musical styles, including cold wave, ethereal wave, gothic rock, neoclassical dark wave and neofolk.