A dirge is a song that evokes feelings of mourning and dread usually used at funerals. Vocals are often chanted and the instrument of choice is the organ. The sound and arrangement of this music was a major influence on doom metal, most notably the subcategory of funeral doom. Song tempos of funeral doom are very slow and make use of keyboards and synthesizers set to an organ sound to create a nightmarish, dream type atmosphere. Dirge influences can also be heard in death/doom, black metal, blackened doom, some sludge metal, and gothic metal.