The rock genre is an umbrella term used to describe a wide variety of musical styles. There are many synonyms to describe the different types of music that fall under the rock genre, including alternative rock, classic rock, heavy metal, punk rock, and indie rock. Alternative rock is often characterized by its non-conformity and experimentation with sound. Classic rock typically consists of rock music from the 1960s and 1970s. Heavy metal features a prominent use of distortion and aggressive guitar riffs, while punk rock is known for its fast-paced, rebellious sound. Indie rock, on the other hand, often features a more subdued, introspective sound with intricate arrangements.