▁other ▁concepts ▁that ▁would ▁have ▁been ▁well ▁known ▁to ▁mus icians ▁of ▁the ▁time . ▁ ▁Ev idence ▁from ▁mechanical ▁clock s ▁to ▁the ▁contrary ▁isn ' t ▁too ▁convin cing ▁once ▁you ▁have ▁this ▁alternative ▁interpretation , ▁because ▁musical ▁clock s , ▁by ▁their ▁nature , ▁are ▁of ▁course ▁mechanical . ▁It ▁could ▁just ▁be ▁a ▁limitation ▁of ▁the ▁craft s men ▁in ▁ability ▁to ▁reproduce ▁the ▁fluid ity ▁of ▁the ▁rh yth ms ▁of ▁mus icians ▁of ▁the ▁time ▁in ▁a ▁clock . ▁ ▁Pres ent ▁day ▁ ▁Jazz ▁ ▁A ▁similar ▁practice ▁to ▁notes ▁in ég ales ▁occurs ▁from ▁the ▁ 2 0 th ▁century ▁to ▁the ▁present ▁day , ▁in ▁jazz , ▁although ▁the ▁term ▁" sw ung ▁note " ▁is ▁used ▁by ▁jazz ▁mus icians ▁and ▁listen ers . ▁Indeed , ▁it ▁is ▁so ▁univers ally ▁understood ▁that ▁a ▁stream ▁of ▁e ighth ▁notes ▁is ▁to ▁be ▁rendered ▁une qu ally ▁that ▁the ▁phrase ▁" stra ight ▁e ighth s " ▁is ▁used ▁whenever ▁a ▁jazz ▁arr anger ▁wants ▁a ▁perform er ▁to ▁play ▁e ighth ▁notes ▁even ly . ▁In ▁jazz ▁practice , ▁in ▁addition , ▁it ▁is ▁common ▁for ▁the ▁notes ▁not ▁only ▁to ▁differ ▁in ▁duration ▁but ▁in ▁intensity . ▁Sw ung ▁e ighth s ▁written ▁on ▁the ▁beat ▁are ▁generally ▁read ▁as ▁quarter - note ▁triple ts , ▁while ▁notes ▁written ▁on ▁off - be ats ▁are ▁played ▁as ▁e ighth ▁note ▁triple ts . ▁Therefore , ▁the ▁underlying ▁rh yth mic ▁grid ▁to