Question: What is the date of birth of the composer of song U Boj, U Boj?
Sentence (from "U boj, u boj"): It was written by Franjo Marković and composed by Ivan Zajc in 1866, who later incorporated it as an aria into his opera "Nikola Šubić Zrinski" (1876) where it is sung by a male choir.
Relevant evidence: Yes