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	Ivan Ostapovich (conductor) Stefania Turkewich - Quartet for Two Violins, Viola and Cello Ivan Ostapovich (conductor) Collegium Musicum Chamber Ensemble (1) Boris Loginov - Triptych for violin, piano and string orchestra (2015) Ivan Ostapovich (conductor), Orest Smovzh (violin), Dmitry Choni Chamber and Organ Music Hall of the Rivne Regional Philharmonic (June 2016) (2) Stefania Turkewich - Symphony No. 1 (1937) Ivan Ostapovich (conductor) Collegium Musicum Chamber Orchestra (3) Franz Xaver Wolfgang Mozart - Piano Concerto No.1 in C-dur (1811), op.14 Olga Zdorenko (piano), Ivan Ostapovich (conductor) , Collegium Musicum Сhamber Orchestra album of 2019 release (3) Franz Xaver Wolfgang Mozart - Piano Concerto No.2 in Es-dur (1818), op.25 Olga Zdorenko (piano), Ivan Ostapovich (conductor) , Collegium Musicum Сhamber Orchestra album of 2019 release (2) Oleg Bezborodko - Concerto for Organ and Orchestra Nadiya Velychko (Оrgan), Ivan Ostapovich (conductor) I. Introduction. Largo - Allegro energico. II. Adagio III. Moderated by sostenuto Orchestra `Ukrainian Festival Orchestra` Lviv Organ Hall. December 27, 2020. The premiere. (4)