Genre-splitting, in popular music, is an art form. In ancient times, you played, rock, soul, jazz or country, case closed. It was probably in the late ‘60s, early ‘70s, that infamous Petri dish of musical change, when the borders began blurring. And things got really interesting.
Dream Theater arrived in the latter part of the 1980s playing a hybrid of progressive rock (aka prog), with its complex melodic and structural changes, and heavy metal – guitars chugging like locomotives, solos screaming, all about thunderous power.
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