Iron Butterfly/Related Articles
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- Heavy metal (music) : Heavy metal (often referred to simply as metal) is a popular genre of rock music that evolved in the late 1960s and early 1970s, from heavy blues and psychedelic rock.
- Led Zeppelin North American Tour 1968–1969 : A concert tour of the United States and Canada by Led Zeppelin, from December 1968 to February 1969.