at ▁couple ts ▁( d ah - D UM , ▁dah - D UM .... ). ▁ ▁The ▁" d ah " ▁anticip ates , ▁or ▁leads ▁into , ▁the ▁" D UM ." ▁ ▁The ▁" d ah " ▁lead - in ▁may ▁or ▁may ▁not ▁be ▁aud ible . ▁ ▁It ▁may ▁be ▁occasionally ▁acc ented ▁for ▁phr asing ▁or ▁dynamic ▁purposes . ▁▁▁ ▁The ▁instruments ▁of ▁a ▁swing ▁rh ythm ▁section ▁express ▁swing ▁in ▁different ▁ways ▁from ▁each ▁other , ▁and ▁the ▁devices ▁evol ved ▁as ▁the ▁music ▁developed . ▁ ▁During ▁the ▁early ▁development ▁of ▁swing ▁music , ▁the ▁bass ▁was ▁often ▁played ▁with ▁lead - in — main - note ▁couple ts , ▁often ▁with ▁a ▁per cuss ive ▁sound . ▁ ▁Later , ▁the ▁lead - in ▁note ▁was ▁dropped ▁but ▁incorpor ated ▁into ▁the ▁physical ▁rh ythm ▁of ▁the ▁bass ▁player ▁to ▁help ▁keep ▁the ▁beat ▁" sol id ." ▁ ▁Similarly , ▁the ▁rh ythm ▁guitar ▁was ▁played ▁with ▁the ▁lead - in ▁beat ▁in ▁the ▁player ' s ▁physical ▁rh ythm ▁but ▁in aud ible . ▁ ▁The ▁piano ▁was ▁played ▁with ▁a ▁variety ▁of ▁devices ▁for ▁swing . ▁ ▁Ch ord ▁patterns ▁played ▁in ▁the ▁rh ythm ▁of ▁a ▁d otted - e ight — six teenth ▁couple t ▁were ▁characteristic ▁of ▁bo og ie - wo og ie ▁playing ▁( s ometimes ▁also ▁used ▁in ▁bo og ie - wo og ie ▁horn ▁section ▁playing ). ▁ ▁The ▁" swing ▁bass "