"Drop C" is a guitar tuning where the lowest string is tuned down two whole steps from standard tuning, resulting in the notes C-G-C-F-A-D. This tuning is popular in various music genres, especially in heavy metal and hard rock, as it creates a heavier sound and allows for easier power chord formations. In Drop C, guitarists can achieve a darker tone and more aggressive riffs. Many bands, such as Avenged Sevenfold and Killswitch Engage, utilize this tuning to enhance their music's intensity and depth, making it a favorite among musicians looking to explore different sonic textures.