"Lobachevsky" is a humorous song by Tom Lehrer, referring to the mathematician Nikolai Lobachevsky. In the introduction, Lehrer describes the song as an adaptation of a routine that Danny Kaye did to honor the Russian actor Constantin Stanislavski. Lehrer sings the song from the point of a view of a preeminent Russian mathematician who learns, from Lobachevsky, that plagiarism is the secret of success in mathematics. The narrator later uses this strategy to get a paper published ahead of a rival, then to write a book and earn a fortune selling the movie rights. Lehrer wrote that he did not know Russian. In the song he quotes two book reviews in Russian, the actual text of which bears no relation: the first phrase quotes Mussorgsky's Song of the Flea: "Once there was a king who had a pet flea." The second references a Russian joke: "Now I must go where even the Tsar goes on foot" [the bathroom].