Rebetiko, plural rebetika, (Greek: ρεμπ?τικο, and ρεμπ?τικα respectively), occasionally transliterated as Rembetiko, is a term used today to designate originally disparate kinds of urban Greek folk music which have come to be grouped together since the so-called rebetika revival, which started in the 1960s and developed further from the early 1970s onwards.