Electro-Harmonix is an American company known for producing high-quality guitar effects pedals and audio equipment. Founded in 1968 by Mike Matthews, the company has gained a reputation for innovative designs and unique sounds, appealing to musicians across various genres. The brand is particularly famous for its iconic products, such as the Big Muff distortion pedal and the Holy Grail reverb. Electro-Harmonix continues to develop new technologies and effects, making it a popular choice among both amateur and professional musicians looking to enhance their sound.