Characteristics
Grindcore relies on standard hardcore punk and heavy metal instrumentation: electric guitar, bass and drums. However, grindcore alters the usual practices of metal or rock music in regard to song structure and tone. The vocal style is "ranging from high-pitched shrieks to low, throat-shredding growls and barks." In some cases, no clear lyrics exist. Vocals may be used as merely an added sound effect, a common practice with bands such as the experimental Naked City.
A characteristic of some grindcore songs is the "microsong", lasting only a few seconds. In 2001, the Guinness Book of World Records awarded Brutal Truth the record for "Shortest Music Video" for 1994's "Collateral Damage" (the song lasts four seconds). In 2007, the video for the Napalm Death song "You Suffer" set a new "Shortest Music Video" record: 1.3 seconds. Beyond the microsong, it is characteristic of grindcore to have short songs in general; for example, Carcass' debut album Reek of Putrefaction (1988) consists of 22 tracks with an average length of 1 minute and 48 seconds.
Many grindcore groups experiment with down-tuned guitars. While the vinyl A-side of Napalm Death's debut, 1987's Scum, is set to standard tuning, on side B, the guitars are tuned down 2½ steps. Their second album From Enslavement to Obliteration and the Mentally Murdered EP were tuned to C♯. Harmony Corruption, their third full-length album, was tuned up to a D. Bolt Thrower went further, dropping 3½ steps down (A). Bass is tuned low as well, and is often distorted.
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