Crust punk (sometimes simply called crust) is one of the evolutions of anarcho-punk and hardcore punk, mixed with extreme metal guitar riffs and bass-heavy instrumentation. The style, which developed in the mid-1980s in the United Kingdom, often had songs with dark, pessimistic lyrics, lingering on political and social issues. Both the musical and lyrical elements were heavily influenced by the band Discharge. Examples of crust punk bands include Amebix, Antisect and Doom.