Pyotr Ivanovich Zasetskiy studied at the Saratov Conservatory.
In 1920, Zasetski made his debut at the Opera house in
He worked at the Stanislavsky
Opera studio and Bolshoi until 1924. During 1924-37,
Zasetskiy sang at different theaters in Leningrad.
From 1937, he sang at the Opera and Ballet Theater in Minsk.
He participated in the creation of Belarusian Operas:
Savka Milgun (V pushakh Polyesya by Bogatyrev), and
Mikita (Tsvyetok schastya by Turenkov (1866-1958)).
Other roles included:
Mishik (Tikhiy Don), Sergei (Lady Macbeth of Minsk), Likov,
Don Basilio, Pedrillo, Ivan (The Nose), Vasya
(Za krasniy Petrograd by Glakovsky and Prussak), etc