ute . ▁▁ ▁Fl utes ▁of ▁the ▁Ak im el ▁O ' od ham ▁culture ▁( o ften ▁referred ▁to ▁by ▁the ▁arch a ic ▁ex onym ▁" P ima ▁fl utes "). ▁These ▁fl utes ▁may ▁have ▁directly ▁evol ved ▁from ▁fl utes ▁of ▁the ▁T oh ono ▁O ' od ham ▁culture , ▁with ▁the ▁addition ▁of ▁a ▁piece ▁of ▁cloth ▁over ▁the ▁sound ▁mechanism ▁to ▁serve ▁as ▁the ▁external ▁block . ▁ ▁It ▁is ▁also ▁possible ▁that ▁instruments ▁were ▁carried ▁from ▁other ▁cult ures ▁during ▁migr ations . ▁ ▁Fl utes ▁of ▁the ▁Mississ ipp ian ▁culture ▁have ▁been ▁found ▁that ▁appear ▁to ▁have ▁the ▁two - ch am ber ed ▁design ▁characteristic ▁of ▁Native ▁American ▁fl utes . ▁They ▁were ▁constructed ▁of ▁river ▁can e . ▁The ▁earliest ▁such ▁fl ute ▁is ▁cur ated ▁by ▁the ▁Museum ▁Col lections ▁of ▁the ▁University ▁of ▁Ark ansas , ▁F ay ette ville . ▁It ▁was ▁recovered ▁in ▁about ▁ 1 9 3 1 ▁by ▁Samuel ▁C . ▁D ell inger ▁and ▁more ▁recently ▁identified ▁as ▁a ▁fl ute ▁by ▁James ▁A . ▁Re es , ▁Jr . ▁of ▁the ▁Ark ansas ▁Ar che ological ▁Society . ▁The ▁artifact ▁is ▁known ▁col lo qu ial ly ▁as ▁" The ▁Bre cken ridge ▁Fl ute " ▁and ▁was ▁conject ured ▁to ▁date ▁in ▁the ▁range ▁ 7 5 0 – 1 3 5 0 ▁CE . ▁ ▁This ▁conject ure ▁proved ▁to ▁be ▁accurate ▁when , ▁in ▁ 2 0 1 3 ,