u oso ▁character -- a ▁bit ▁too ▁easy ." ▁Br is elli ' s ▁account ▁was ▁that ▁he ▁liked ▁them ▁very ▁much ▁but ▁suggested ▁to ▁Bar ber ▁when ▁writing ▁the ▁third ▁movement , ▁he ▁might ▁explore ▁more ▁of ▁the ▁virt u os ic ▁side ▁of ▁the ▁viol in ' s ▁capabilities . ▁Bar ber ▁then ▁says ▁he ▁asked ▁Br is elli ▁" what ▁type ▁of ▁brilliant ▁technique ▁best ▁su ited ▁him ; ▁he ▁told ▁me ▁he ▁had ▁no ▁preference ." ▁Bar ber ▁continues : ▁" At ▁that ▁time , ▁he ▁did ▁not ▁apparently ▁dis like ▁the ▁idea ▁of ▁a ▁' per pet ual ▁motion ' ▁for ▁the ▁last ▁movement ." ▁Bar ber ▁says ▁that ▁he ▁" work ed ▁very ▁hard " ▁on ▁the ▁last ▁movement , ▁finishing ▁it ▁" in ▁far ▁from ▁ideal ▁circumstances " ▁( his ▁father ' s ▁ill ness ), ▁and ▁sent ▁the ▁viol in ▁part ▁to ▁Br is elli ▁about ▁two ▁months ▁before ▁the ▁intended ▁premi ere . ▁Bar ber ▁says ▁that ▁" It ▁is ▁difficult , ▁but ▁only ▁last s ▁four ▁minutes ." ▁Bar ber ▁never ▁mentions ▁Me iff ' s ▁proposal ▁that ▁the ▁three ▁of ▁them ▁meet ▁in ▁regards ▁to ▁alter ations ▁of ▁the ▁viol in ▁part ▁of ▁the ▁first ▁two ▁movements , ▁or ▁Me iff ' s ▁desire ▁to ▁" adv ise " ▁Bar ber ▁on ▁the ▁third ▁movement ▁while ▁it ▁was ▁being ▁written . ▁ ▁Bar ber ▁then ▁dis clos es ▁to ▁F els ▁that ▁when ▁he ▁sent ▁the ▁finale ▁to ▁Br is elli ,