▁ ▁It ▁is ▁a ▁work ▁in ▁three ▁movements , ▁last ing ▁about ▁ 2 2 ▁minutes . ▁ ▁History ▁In ▁ 1 9 3 9 , ▁Philadelphia ▁industrial ist ▁Samuel ▁S ime on ▁F els ▁commission ed ▁Bar ber ▁to ▁write ▁a ▁viol in ▁con cer to ▁for ▁F els ' ▁w ard , ▁I so ▁Br is elli , ▁a ▁gradu ate ▁from ▁the ▁Curt is ▁Institute ▁of ▁Music ▁the ▁same ▁year ▁as ▁Bar ber , ▁ 1 9 3 4 . ▁The ▁Bar ber ▁bi ograph ies ▁written ▁by ▁Nathan ▁Bro der ▁( 1 9 5 4 ) ▁and ▁Barbara ▁B . ▁He yman ▁( 1 9 9 2 ) ▁discuss ▁the ▁gen esis ▁of ▁the ▁con cer to ▁during ▁the ▁period ▁of ▁its ▁commission ▁and ▁the ▁subsequent ▁year ▁leading ▁up ▁to ▁the ▁first ▁performance . ▁He yman ▁interview ed ▁Br is elli ▁and ▁others ▁familiar ▁with ▁the ▁history ▁in ▁her ▁publication . ▁In ▁late ▁ 2 0 1 0 , ▁previously ▁un pub lished ▁letters ▁written ▁by ▁F els , ▁Bar ber , ▁and ▁Albert ▁Me iff ▁( B ris elli ' s ▁viol in ▁coach ▁in ▁that ▁period ) ▁from ▁the ▁Samuel ▁S ime on ▁F els ▁Pap ers ▁arch ived ▁at ▁the ▁Historical ▁Society ▁of ▁Pennsylvania ▁became ▁available ▁to ▁the ▁public . ▁▁ ▁Bar ber ▁accepted ▁F els ' s ▁advance ▁and ▁went ▁to ▁Switzerland ▁to ▁work ▁on ▁the ▁con cer to . ▁Bar ber ▁started ▁working ▁on ▁the ▁first ▁two ▁movements ▁in ▁Switzerland ▁during ▁the ▁summer ▁of