Antonín (or Anton) Dvořák was an Earth composer in the late 19th century. Dvořák's main focus was romantic music and wrote a series of musical compositions which he titled The Slavonic Dances. When Captain Jean-Luc Picard called up his musical composition Picard Mozart trio, Program 1, the music began to distort and turned into The Slavonic Dances. The cause of this was a malfunction in an interface between the USS Enterprise-D computer and Data, who engaged in a study of Dvorak's collected works, in 2369. (TNG: "A Fistful of Datas" )