Since progressive rock first arose out of British and North American psychedelia, it has crossed every boundary that it could identify, which makes it like metal more a question of a spirit than a concrete set of musical or extra-musical traits. We can identify a few aspects of this spirit: a desire to make unique song forms which fit the shifting demands of their content, a passion for exploring melody and harmony, an obsession with the unconventional, and a chameleon-like ability to explore other styles and adopt them as its own.
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