, ▁ten or , ▁bass ) ▁in ▁every ▁instrument - category ; ▁as ▁known ▁in ▁the ▁cho ir , ▁the ▁wood w inds ▁and ▁ ▁the ▁br ass ▁family , ▁whereas ▁in ▁the ▁usual ▁string ▁quart et ▁the ▁ten or ▁range ▁is ▁distributed ▁between ▁the ▁vi ola ▁and ▁the ▁c ello . ▁ ▁Tun ing ▁▁ ▁Its ▁pitch ▁is ▁one ▁oct ave ▁below ▁the ▁viol in ▁and ▁the ▁strings ▁are ▁tun ed ▁as ▁G 2 , ▁D 3 , ▁A 3 , ▁E 4 . ▁ ▁The ▁notation ▁is ▁either ▁in ▁G - cle f ▁( s ounds ▁one ▁oct ave ▁lower ▁than ▁written ); ▁or ▁in ▁C - cle f ▁( s ounds ▁one ▁fourth ▁lower ▁than ▁written ). ▁ ▁History ▁ ▁The ▁vi ola ▁prof onda ▁was ▁invent ed ▁by ▁the ▁Boliv ian ▁composer , ▁director ▁and ▁instrument - developer ▁Ger ardo ▁Y añ ez ; ▁the ▁unique ▁spec imen ▁was ▁pat ented ▁in ▁ 2 0 0 7 . ▁▁ ▁It ▁has ▁been ▁presented ▁officially ▁the ▁first ▁time ▁on ▁November ▁ 2 , ▁ 2 0 0 8 ▁at ▁the ▁St . ▁Thomas ▁Church , ▁Leipzig - G erm any ▁and ▁on ▁January ▁ 1 4 , ▁ 2 0 1 0 ▁at ▁the ▁Berliner ▁Phil harm onie . ▁ ▁Compos itions ▁▁ 2 0 0 2 ▁ ▁" O fr enda " ▁( Cont empl ative ▁Med itation ) ▁– ▁vi ola ▁Prof onda ▁solo ▁– ▁Ger ardo ▁Y añ ez . ▁▁ 2 0 0 8 ▁ ▁"