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In page Rebetiko:

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Initially a music associated with the lower classes, rebetiko later reached greater general acceptance as the rough edges of its overt subcultural character were softened and polished, sometimes to the point of unrecognizability. Then, when the original form was almost forgotten, and its original protagonists either dead, or in some cases almost consigned to oblivion, it became, from the 1960s onwards, a revived musical form of wide popularity, especially among younger people of the time.