Which Russian opera singer with a basso profundo vocal range died April 12, 1938?
Basso profondo Basso profondo (Italian: "deep bass"), sometimes basso profundo or contrabass, is the bass voice subtype with the lowest vocal range.
Ivan Ivanovich Petrov Ivan Ivanovich Petrov (Russian: Иван Иванович Петров ; b. February 29, 1920 in Irkutsk ― d. December 26, 2003 in Moscow) was a Russian bass opera singer.