umb ria ▁Category : 1 9 6 8 ▁establish ments ▁in ▁England <0x0A> </s> ▁Fol k ▁music ▁includes ▁traditional ▁folk ▁music ▁and ▁the ▁genre ▁that ▁evol ved ▁from ▁it ▁during ▁the ▁ 2 0 th - century ▁folk ▁rev ival . ▁Some ▁types ▁of ▁folk ▁music ▁may ▁be ▁called ▁world ▁music . ▁Trad itional ▁folk ▁music ▁has ▁been ▁defined ▁in ▁several ▁ways : ▁as ▁music ▁transm itted ▁or ally , ▁music ▁with ▁unknown ▁compos ers , ▁or ▁music ▁performed ▁by ▁custom ▁over ▁a ▁long ▁period ▁of ▁time . ▁It ▁has ▁been ▁contrast ed ▁with ▁commercial ▁and ▁classical ▁styles . ▁The ▁term ▁origin ated ▁in ▁the ▁ 1 9 th ▁century , ▁but ▁folk ▁music ▁extends ▁beyond ▁that . ▁ ▁Starting ▁in ▁the ▁mid - 2 0 th ▁century , ▁a ▁new ▁form ▁of ▁popular ▁folk ▁music ▁evol ved ▁from ▁traditional ▁folk ▁music . ▁This ▁process ▁and ▁period ▁is ▁called ▁the ▁( second ) ▁folk ▁rev ival ▁and ▁reached ▁a ▁z en ith ▁in ▁the ▁ 1 9 6 0 s . ▁This ▁form ▁of ▁music ▁is ▁sometimes ▁called ▁contemporary ▁folk ▁music ▁or ▁folk ▁rev ival ▁music ▁to ▁distinguish ▁it ▁from ▁earlier ▁folk ▁forms . ▁ ▁Sm aller , ▁similar ▁rev iv als ▁have ▁occurred ▁elsewhere ▁in ▁the ▁world ▁at ▁other ▁times , ▁but ▁the ▁term ▁folk ▁music ▁has ▁typically ▁not ▁been ▁applied ▁to ▁the ▁new ▁music ▁created ▁during ▁those ▁rev iv als . ▁This ▁type ▁of ▁folk ▁music ▁also ▁includes ▁fusion ▁gen res ▁such ▁as ▁folk ▁rock , ▁folk ▁metal , ▁and ▁others