Pianism means studying piano music. It presupposes virtuoso performing skills.
This term has a slightly different meaning in the life of Sergei Musaelian, the protagonist of the movie, Merited Worker of Arts of Russia, winner of international competitions, "Man of the Year" according to the North-American biographic center in the USA. In the film Sergei Musaelian plays S.Prokofiev, P.Tchaikovsky, F.Chopin, V.Horovits etc.