Assertion: progressive rock | /r/HasProperty | one of the forgotten keys
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Source sentences:
text: Complexity is something that would become more prominent in later metal which is a big part of why I think progressive rock is one of the forgotten keys to the development of the metal genre.
text: Complexity is something that would become more prominent in later metal which is a big part of why I think progressive rock is one of the forgotten keys to the development of the metal genre.