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.[1][2][3][4][5]
^Aledort, Andy (7 April 2010). "Atreyu: Prior Convictions". Guitar World. Retrieved 23 November 2011. ...drop C tuning, which is like drop D but with all of the strings down a whole step [low to high: C G C F A D]. Drop C sounds a little more brutal. Because of its deeper, heavier sound, it is commonly used in metal.
^Mercedes-Benz Enthusiast Channel 1 (12 July 2009), HEAVEN & HELL - Follow The Tears, archived from the original on 13 December 2021, retrieved 5 April 2016{{citation}}: CS1 maint: numeric names: authors list (link)
^"Nickelback Equipment". Archived from the original on 20 May 2010. Retrieved 13 May 2014. ...(Drop D One Whole Step Down CGCFAD, Drop C CADGBE and Drop B BADGBE)
^Adriaensen, Wouter. "Ruben Block gear". Blues Online. Retrieved 13 May 2014. Ruben also plays ... a Melody Maker in CGCFAD tuning - which is dropped D tuning one full tone down...
^The Tallest Man On Earth - Topic (30 November 2014), The Sparrow and the Medicine, archived from the original on 13 December 2021, retrieved 4 March 2019
^"A Brief History of Hawaiian Slack Key Guitar"(PDF). Dancing Cat Records. Retrieved 13 May 2014. ... C-G-D-G-B-E Tuning (often called "Keola's C", because it has been used most prominently by Slack Key guitarist Keola Beamer)