▁Mac K ay ▁MS ▁( 1 8 4 0 ). ▁▁ ▁Ang us ▁Mac K ay ' s ▁book ▁A ▁Collection ▁of ▁An cient ▁P io ba ire ach d ▁or ▁High land ▁Pi pe ▁Music , ▁published ▁in ▁ 1 8 3 8 , ▁documented ▁and ▁presented ▁the ▁p ib ro ch ▁re per toire ▁in ▁staff ▁notation ▁with ▁supp lement ary ▁comment ary ▁by ▁anti qu arian ▁James ▁Log an . ▁Mac K ay ▁simplified ▁many ▁of ▁the ▁p ib ro ch ▁compos itions , ▁editing ▁out ▁complex ▁orn ament ation ▁and ▁asym met ries ▁that ▁were ▁evident ▁in ▁documentation ▁of ▁the ▁same ▁compos itions ▁published ▁in ▁earlier ▁manuscript s ▁such ▁as ▁the ▁Campbell ▁Can nt aire ach d ▁MS . ▁He ▁also ▁specified ▁regular ▁time ▁sign atures ▁that ▁standard ised ▁and ▁reg ulated ▁a ▁music ▁that ▁was ▁tradition ally ▁performed ▁with ▁express ive ▁rub ato ▁rh yth mic ▁interpretation ▁of ▁the ▁musical ▁phr asing ▁and ▁dynamics . ▁Mac K ay ' s ▁staff ▁not ated ▁edited ▁version ▁of ▁p ib ro ch ▁became ▁the ▁author itative ▁reference ▁for ▁the ▁ 1 9 th - ▁and ▁ 2 0 th - century ▁rev ival ▁of ▁p ib ro ch , ▁and ▁greatly ▁influenced ▁subsequent ▁modern ▁p ib ro ch ▁performance . ▁ ▁In ▁ 1 9 0 3 , ▁The ▁P ì ob aire ach d ▁Society ▁was ▁founded ▁with ▁the ▁aim ▁of ▁recording ▁the ▁cor pus ▁of ▁existing ▁p ib ro ch ▁t unes , ▁coll ating ▁the ▁various ▁versions