An alternate tuning for the guitar, CGCFAD as opposed to EADGBE. More commonly (and mistakenly) referred to as Drop C.

Many bands utilize this particular tuning, including, but not limited to, As I Lay Dying, Killswitch Engage, System of a Down, Children of Bodom, Lostprophets, Breaking Benjamin, Bullet For My Valentine, Rammstein, Atreyu, Senses Fail, From First To Last, Metallica, Norma Jean, Thrice, A7X