Antonei Sergejvitch Tartarov  was a fictional Russian pianist whose real name was Jean-Jacques Hauser.

He had an exceptional gift for improvisation.

On April 16, 1968 Hauser fooled an audience of 2,000 people in Zurich into thinking not only that he was a little-known Russian virtuoso (Tartarov), but that much of the improvised material in his program was composed by Beethoven, Mozart, Prokofiev, and Liszt.

Imagine when it was announced that the music the audience had just applauded as works of genius had actually been improvised on the spot by a home-grown Swiss pianist.