ms ▁and ▁tem pos ▁of ▁the ▁p ib ro ch ▁t une ▁are ▁primarily ▁acquired ▁from ▁an ▁experienced ▁teacher ▁and ▁applied ▁through ▁interpret ive ▁performance ▁practice . ▁ ▁Str ucture ▁Rel ated ▁ce ò l ▁m ór ▁gen res ▁were ▁histor ically ▁also ▁played ▁on ▁the ▁fiddle ▁and ▁on ▁the ▁wire - str ung ▁G ael ic ▁har p ▁or ▁cl ars ach . ▁The ▁cl ars ach ▁ce ò l ▁m ór ▁is ▁likely ▁to ▁have ▁pred ated ▁and ▁influenced ▁the ▁later ▁pipe ▁and ▁fiddle ▁music . ▁However , ▁p ib ro ch ▁in ▁its ▁current ▁form ▁was ▁developed ▁on ▁the ▁Great ▁High land ▁Bag pipe , ▁with ▁most ▁of ▁the ▁ext ant ▁p ib ro ch ▁t unes ▁being ▁adapted ▁to ▁or ▁written ▁specifically ▁for ▁the ▁G H B , ▁and ▁as ▁a ▁result ▁the ▁musical ▁form ▁is ▁influenced ▁by ▁features ▁and ▁limitations ▁of ▁that ▁instrument . ▁ ▁In ▁musical ▁structure , ▁p ib ro ch ▁is ▁a ▁theme ▁with ▁variations . ▁The ▁theme ▁is ▁usually ▁a ▁very ▁simple ▁mel ody , ▁though ▁few ▁if ▁any ▁p ib ro ch ▁contain ▁the ▁theme ▁in ▁its ▁simplest ▁form . ▁The ▁theme ▁is ▁first ▁stated ▁in ▁a ▁slow ▁movement ▁called ▁the ▁ground ▁or ▁in ▁G ael ic ▁the ▁ ù rl ar . ▁This ▁is ▁usually ▁a ▁fairly ▁st yl ised ▁version ▁of ▁the ▁theme , ▁and ▁usually ▁includes ▁numerous ▁added ▁emb ell ish ments ▁and ▁connecting ▁notes . ▁ ▁The ▁subsequent ▁variations ▁can ▁number ▁from ▁one ▁up ▁to ▁about ▁twenty , ▁although