Question: What was the middle name of the pianist who first performed Prokofiev's Piano Sonata No. 8?
Sentence (from "Emil Gilels"): Emil Grigoryevich Gilels (sometimes transliterated "Hilels"; , Russian: Эми́ль Григо́рьевич Ги́лельс , "Emiľ Grigorievič Gileľs "; 19 October 1916 – 14 October 1985) was a Soviet pianist, widely regarded as one of the greatest pianists of the 20th century.
Relevant evidence: Yes