▁the ▁And ante , ▁yet ▁the ▁rest ▁of ▁the ▁movement ▁– ▁and ▁the ▁rest ▁of ▁the ▁son ata ▁– ▁was ▁left ▁un written . ▁Years ▁later , ▁in ▁ 1 9 7 2 , ▁the ▁Russian ▁music ologist ▁and ▁composer , ▁Vladimir ▁Blo k , ▁set ▁about ▁comple ting ▁Pro k of iev ' s ▁Son ata ▁for ▁Solo ▁C ello ▁as ▁a ▁single , ▁perform able ▁movement . ▁ ▁Perform ances ▁ ▁Blo k ' s ▁reconst ruction ▁of ▁the ▁Son ata ▁for ▁Solo ▁C ello ▁was ▁premier ed ▁by ▁Natal ia ▁Gut man ▁in ▁Moscow ▁in ▁ 1 9 7 2 , ▁and ▁was ▁published ▁the ▁next ▁year ▁by ▁Musik ver lag ▁Hans ▁S ikor ski . ▁It ▁was ▁not ▁until ▁a ▁de cade ▁later , ▁in ▁ 1 9 8 4 , ▁that ▁the ▁first ▁recording ▁of ▁the ▁work ▁was ▁made ▁by ▁the ▁British ▁cell ist , ▁Steven ▁Is ser lis . ▁ ▁Rost rop ov ich ▁himself ▁never ▁recorded ▁the ▁son ata ▁although ▁he ▁is ▁known ▁to ▁have ▁performed ▁it ▁during ▁his ▁lifetime . ▁In ▁addition ▁to ▁Is ser lis , ▁record ings ▁were ▁made ▁by ▁Alexander ▁I v ash kin , ▁Rap ha el ▁Wall f isch , ▁and ▁Yan ▁Lev ion no is . ▁Perform ances ▁generally ▁run ▁between ▁ 8 ▁and ▁ 1 2 ▁minutes . ▁ ▁Is ser lis ▁performed ▁this ▁work ▁at ▁the ▁fun er als ▁of ▁both ▁L ina ▁Pro k of iev ▁( the ▁composer ' s ▁first ▁wife ) ▁and ▁O