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Rock is a broad genre of popular music that originated as 'rock and roll' in the United States in the late 1940s and early 1950s. It is characterized by a strong beat, simple chord progressions, and often revolves around the electric guitar, bass guitar, and drums. Over the decades, rock music has evolved, giving rise to various subgenres such as punk rock, hard rock, and alternative rock. Known for its energetic and rebellious nature, rock music often addresses themes of love, freedom, and social issues. It has been a driving force in shaping cultural movements and has a significant influence on fashion, attitude, and lifestyle.