Koshkin first came to prominence with his suite The Prince's Toys, completed in 1980 and first performed by the Czech-born guitarist Vladimir Mikulka.
Koshkin's best-known guitar work is Usher-Waltz (1984), a piece inspired by the Edgar Allan Poe story The Fall of the House of Usher, written for the guitarist Vladislav Blaha.
[2] His other important works include the set of variations The Porcelain Tower and the Andante quasi Passacaglia e Toccata: The Fall of Birds (1978).
Koshkin received his first guitar from his grandfather, along with a recording of Segovia's, which inspired him to become a guitarist, despite his parents intending a diplomatic career for him.
[3] Koshkin studied classical guitar at the Moscow College of Music under Georgi Emanov and later at the Gnessin Institute under Alexander Frauchi, with compositional teaching from Victor Egorov.