He participated in the “Academic Fraternity”, where he met Ivan Franko and composer, conductor and public figure Anatole Vakhnianyn.

[4] Ostap Nyzhankivskyi was buried at the cemetery in the city Stryi in the family tomb together with his wife Olena Nyzhankivska (née Bachynska).

He founded the music publishing house Muzykalna Biblioteka (1885) and compiled the Ukraïns’ko-rus’kyi spivanyk (Українсько-руський співаник Ukrainian-Ruthenian Songbook, 1907).

[5] His choir compositions ‘Hulialy’ (Гуляли, They Danced) and ‘Z Okrushkiv’ (З окрушків, From Crumbs, text by Yuriy Fedkovych) became very popular.

Ostap Nyzhankivskyi wrote the carols "God Is Born" (Boh sya rozhdaye, Бог ся рождає),[6] "Heaven and earth" (Nebo i zemlya, Небо і земля),[7] "News in Bethlehem" (Vo Vyfleyemi nyni novyna, Во Вифлеємі нині новина)[8] and others... Ostap Nyzhankovsky was elected to the Galician Diet in 1908–13.