Olga Arefieva was the student of the singer who was best known for his rendition of what song?
Olga Arefieva:  She graduated from Gnessin State Musical College (her teacher was Lev Leshchenko), founded band "Kovcheg" ("The Ark"), composed more than 400 songs, issued 15 music albums, and won the literary prize of the magazine "Znamya" for her poems. Lev Leshchenko: Lev Valerjanovich Leshchenko (Russian: Лев Валерианович Лещенко ; born 1 February 1942), is a Russian singer, who was best known for his rendition of "Den Pobedy" and the 1980 Summer Olympics closing ceremony theme song "Do svidanja, Moskva".
Den Pobedy