▁de ▁C ám ara ▁de ▁Madrid ” ▁and ▁the ▁“ Or questa ▁S inf ónica ▁y ▁de ▁C ám ara ▁de ▁San ▁Sebast i án ”, ▁of ▁which ▁he ▁is ▁the ▁founder . ▁In ▁ 1 9 6 8 , ▁he ▁was ▁appointed ▁as ▁First ▁Vi olin ▁of ▁the ▁“ C u art eto ▁Cl ás ico ” ▁of ▁R TV E , ▁particip ating ▁with ▁pian ist ▁Isabel ▁Pic aza ▁González ▁in ▁the ▁“ Qu int eto ▁Cl ás ico ▁de ▁R NE ”, ▁with ▁which ▁he ▁offered ▁concert s ▁and ▁made ▁numerous ▁record ings ▁in ▁Spain ▁and ▁other ▁countries . ▁He ▁also ▁tou red ▁extens ively ▁through ▁the ▁US . ▁ ▁Other ▁prominent ▁Cub an ▁viol in ists ▁from ▁the ▁first ▁half ▁of ▁the ▁ 2 0 th ▁century ▁are : ▁Ro bero ▁Val d és ▁Arn au ▁( 1 9 1 9 - 1 9 7 4 ), ▁Alberto ▁Bo let ▁and ▁Vir g ilio ▁Di ago . ▁ ▁After ▁ 1 9 5 9 , ▁already ▁in ▁the ▁post ▁revolution ary ▁period , ▁stands ▁out ▁a ▁Cub an ▁viol in ist ▁that ▁has ▁made ▁a ▁substantial ▁contribution , ▁not ▁just ▁to ▁the ▁development ▁of ▁the ▁viol in ▁and ▁the ▁bow ed ▁string ▁instruments , ▁but ▁also ▁to ▁the ▁national ▁musical ▁culture ▁in ▁general . ▁ ▁E vel io ▁T iel es ▁began ▁to ▁study ▁music ▁in ▁Cuba ▁with ▁his ▁father , ▁E vel io ▁T iel es ▁Sol er , ▁when ▁he ▁was ▁just ▁seven ▁years ▁old , ▁and