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Songwriters have their roots in the folk-acoustic traditions of Celtic European troubadours from the Middle East and blues and country in the United States; the genre emerges again in the 1960s against the backdrop of political change.
The US heavy metal sound has big hooks, melodic choruses, and monster ballads, with nearly every song featuring one guitar solo; they also include extensive used of harmonies, particularly in the ballads.
By the dawn of the 1970s, progressive rock allowed musicians to evolve a single track over a whole side of vinyl, draw on classical sources, and create music in more complex time signatures.