Dmitry Bortniansky Portrait by Mikhail Belsky (1788) (Dmytro Stepanovych Bortniansky , 28 October 1751–10 October /O.S. 28 September 1825), was a Ukrainian and Russian composer and conductor (he was born in the city of Glukhov (in present-day Ukraine), then a part of the autonomous Cossack Hetmanate within the Russian Empire). Sinfonia concertante in B Flat Major Bortniansky was critical to the ..