Heavy metal is a rather broad and ambiguous term that describes many different takes on the same genre, with each band having its own individual approach. As metal bands go out of their way to sound different from one another, it is often difficult to pinpoint exactly what it is in metal that ties all of the bands together under a one genre with a universal sound. The aforementioned tritone is perhaps the greatest example of what metal bands have in common, as far as music theory is concerned. Music is constructed using melodies that are phrased over harmonies, which are built from keys. Keys in music are an organization of tones that all share a common overtones sequence, overtones being the frequencies that are sounded by an instrument when a tone is played but not necessarily heard, that lends to a uniform euphonic sound. Each tone in a key is separated by a set of intervals specific to that key, with each interval being numbered according to its ascending order in the relative octave. The tritone is the fifth interval of any minor key moved down halfway between the fourth and fifth intervals, creating a dissonant sound. The fifth interval is considered to be one of the most consonant intervals in music, so just moving it off slightly gives a very tense …show more content…
Metal bands have relied heavily on the tritone to create a tense and disturbing atmosphere to their music, though other vehicles have been found to make metal music far more chaotic and dysphonic. One of the greatest innovations to the overall sound of metal came from the introduction to screamed or growled vocals in the early 1980s. The British grindcore band Napalm Death are often credited with the earliest use of screamed vocals, called death growls, in their 1981 debut album, which utilize a section of the vocal chords not used for regular speech. Death growls were later picked up by death metal prototype Death, a band from Orlando, Florida, known for the creation of extreme metal. From there screamed vocals spread to black metal where they were utilized to create a shrieking sound, meant to sound like that of one possessed, and held sway through the inception of metalcore in the late 1990s, which continues to be the most popular form of extreme metal today. Death growling is the single most divisive facet of metal, setting it apart from almost every other style of music, creating inhuman sounds that are meant to disturb the listener and fit the chaotic pace of heavy metal. In his article “Voices From Hell,” San Fransisco Bay Guardian columnist Will York