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ELP is the progressive rock band co-founded by Greg Lake after his departure from King Crimson. Formed in 1970 with Keith Emerson and Carl Palmer, ELP gained immense popularity throughout the 1970s, known for their elaborate compositions, virtuosic musicianship, and Lake's distinct singing style. The band achieved commercial success with albums like "Trilogy" and "Brain Salad Surgery," leaving a lasting impact on the development of progressive rock music.