Drop D tuning

Drop D tuning is an alternative form of guitar tuning in which the lowest (sixth) string is tuned down from the usual E of standard tuning by one whole step to D. So where standard tuning is E₂A₂D₃G₃B₃E₄ (EADGBe), drop D is D₂A₂D₃G₃B₃E₄ (DADGBe). Drop D tuning, as well as other lowered altered tunings, are often used with the electric guitar in heavy metal music. It is also used in blues, country, folk (often with acoustic guitar), and classical guitar.