Leoš Janáček (1854–1928) was a prominent Czech composer, music theorist, folklorist, publicist, and teacher. Drawing inspiration from Moravian, Slavic, and Eastern European folk music, he developed a distinctive modern style notable for its originality and use of speech rhythms. Born in Hukvaldy and educated in Brno, Prague, Leipzig, and Vienna, Janáček spent much of his life in Brno, where he combined musical composition with extensive folk research. Early influences included Antonín Dvořák, but Janáček’s mature works broke new ground, especially after the death of his daughter. His breakthrough came with the opera Jenůfa, which earned international acclaim and opened doors to major opera houses. Later celebrated works such as Káťa Kabanová, The Cunning Little Vixen, the Sinfonietta, and Glagolitic Mass showcased his unique blend of folk traditions, personal expression, and literary inspiration. Janáček’s legacy was championed globally after his death, particularly by conductor Charles Mackerras. Today, he stands alongside Dvořák and Smetana as one of the foremost Czech composers, renowned for his profound influence on modern music.