"We tune to C#, which creates sourness. It's not a tuning a lot of guitarists want to stay in – it's kind of out of tune. We create something evocative in that dissonance": How Sleater-Kinney use guitar as an agent of beauty and chaos
Carrie Brownstein and Corin Tucker strive to create a sound that’s “out-of-tune-adjacent” – and they use their opposing playing styles and “corrosive” pedals to channel tragedy and joy
Source: guitarworld.com