FD SS ). ▁Sh arp ▁campaign ed ▁with ▁some ▁success ▁to ▁have ▁English ▁traditional ▁songs ▁( in ▁his ▁own ▁heavily ▁edited ▁and ▁exp urg ated ▁versions ) ▁to ▁be ▁taught ▁to ▁school ▁children ▁in ▁hopes ▁of ▁rev iving ▁and ▁prolong ing ▁the ▁popular ity ▁of ▁those ▁songs . ▁Through out ▁the ▁ 1 9 6 0 s ▁and ▁early ▁to ▁mid - 1 9 7 0 s , ▁American ▁scholar ▁Ber tr and ▁Harris ▁Br ons on ▁published ▁an ▁exhaust ive ▁four - volume ▁collection ▁of ▁the ▁then - known ▁variations ▁of ▁both ▁the ▁texts ▁and ▁t unes ▁associated ▁with ▁what ▁came ▁to ▁be ▁known ▁as ▁the ▁Child ▁Can on . ▁He ▁also ▁advanced ▁some ▁significant ▁theories ▁concerning ▁the ▁work ings ▁of ▁or al - a ural ▁tradition . ▁ ▁Similar ▁activity ▁was ▁also ▁under ▁way ▁in ▁other ▁countries . ▁One ▁of ▁the ▁most ▁extensive ▁was ▁perhaps ▁the ▁work ▁done ▁in ▁R iga ▁by ▁K ris jan is ▁Bar ons , ▁who ▁between ▁the ▁years ▁ 1 8 9 4 ▁and ▁ 1 9 1 5 ▁published ▁six ▁volumes ▁that ▁included ▁the ▁texts ▁of ▁ 2 1 7 , 9 9 6 ▁Lat v ian ▁folk ▁songs , ▁the ▁Lat v ju ▁d ain as . ▁In ▁Norway ▁the ▁work ▁of ▁collect ors ▁such ▁as ▁Lud v ig ▁Math ias ▁Lin de man ▁was ▁extens ively ▁used ▁by ▁Ed vard ▁Gr ieg ▁in ▁his ▁Ly ric ▁Pie ces ▁for ▁piano ▁and ▁in ▁other ▁works , ▁which ▁became ▁imm ens ely ▁popular . ▁