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Metamorphic rock - Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form" (from the Greek words meta, "change", and morphe, "form"). The protolith is subjected to extreme heat (greater than 150 degrees Celsius) and pressure causing profound physical and/or ...
Acid rock - Acid rock is a form of psychedelic music and was the first form of it to achieve popular acclaim. The term acid rock was much used in its heyday, but has fallen into disuse except for putting this music into its historical perspective.
Rock opera - A rock opera or rock musical is a musical production in the form of an opera or a musical in a modern rock and roll style rather than more traditional forms. It differs from conventional rock and roll music, which is often a song that is ...
Progressive rock - Progressive rock (shortened to prog, or prog rock when differentiating from other "progressive" genres) is an ambitious, eclectic, and often grandiose style of rock music which arose in the late 1960s, reached the peak of its popularity in the early 1970s, and continues as a musical form to this ...
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