Acid Rock is a subgenre of rock music that emerged in the mid-1960s, characterized by its heavy use of distorted guitars, extended solos, and psychedelic influences. It often features lyrics that explore themes of altered states of consciousness, drug use, and counterculture. Bands like The Grateful Dead and Jefferson Airplane are notable examples of this genre. The music is typically associated with the Hippie movement and the broader Psychedelic culture of the time. Acid Rock played a significant role in the evolution of rock music, influencing later genres such as Heavy Metal and Psychedelic Rock. Its legacy continues to resonate in contemporary music.