C tuning (guitar)

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C tuning is a type of guitar tuning. The strings of the guitar are tuned two whole steps lower than standard tuning. The resulting notes can be described most commonly as C-F-A♯-D♯-G-C or C-F-B♭-E♭-G-C. This is not to be confused with C♯ tuning, which is one and one half steps lower than standard tuning.

The tuning is commonly used by metal and hard rock artists to achieve a heavier, deeper sound. Slackening regular strings on a regular guitar to a lower pitch makes bending easier. Depending on personal playing style, some guitarists find this desirable, while others switch to heavier-gauge strings to avoid unintentional bending and to play chords in tune more easily. Another option is the use of a baritone guitar, which is built slightly longer and stronger than a regular guitar to achieve the desired pitch with heavy strings at average tensions.