Drop C tuning

Drop C tuning is an alternative guitar tuning where at least one string has been lowered to a C, but most commonly refers to CGCFAD, which can be described as D tuning with a 6th string dropped to C, or drop D tuning transposed down a whole step.

Because of its heavier tone, it is most commonly used in rock and heavy metal music.

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Drop C tuning (CGCFAD)
Drop C tuning (CGCFAD) (listen)