Which Russian opera singer with a basso profundo vocal range died April 12, 1938?
Feodor Chaliapin: Feodor Ivanovich Chaliapin (Russian: Фёдор Ива́нович Шаля́пин , "Fyodor Ivanovich Shalyapin"; ] ; February 13 [O.S. February 1] 1873 April 12, 1938) was a Russian opera singer. Feodor Chaliapin:  Possessing a deep and expressive bass voice, he enjoyed an important international career at major opera houses and is often credited with establishing the tradition of naturalistic acting in his chosen art form. Basso profondo: Basso profondo (Italian: "deep bass"), sometimes basso profundo or contrabass, is the bass voice subtype with the lowest vocal range.
Feodor Ivanovich Chaliapin