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	Alexander Kovalchuk (trombone) Derek Bourgeois - Concerto for Bass Trombone and Orchestra Alexander Kovalchuk (Trombone) 5.03.2016, St. Petersburg, Hermitage Theater, part 1 (1) Jan Koetsier - Allegro Maestoso Alexander Kovalchuk (Trombone) , Orchestra of the Mariinsky Theatre 2016, dir. A.Repnikov (1)