He was inspired by Moravian and all Slavic folk music to create an original, modern musical style. Until 1895 he devoted himself mainly to folkloristic research and his early musical output was influenced by contemporaries such as Antonín Dvořák. His later, mature works incorporate his earlier studies of national folk music in a modern, highly original synthesis, first evident in the opera Jenůfa, which was premiered in 1904 in Brno. The success of Jenůfa at Prague in 1916 gave Janáček access to the world's great opera stages. Janáček's later works are his most celebrated. They include the symphonic poem Sinfonietta, the oratorio Glagolitic Mass, the rhapsody Taras Bulba, two string quartets, other chamber works and operas. Along with Antonín Dvořák and Bedřich Smetana, he is considered one of the most important Czech composers.