What Czech operatic contralto had a close partnership with the composer of "The Bartered Bride"?
Betty Fibichová:  The greatest Czech operatic contralto of her day, she enjoyed close artistic partnerships with both Antonín Dvořák and Bedřich Smetana in addition to collaborating frequently with her husband. Bedřich Smetana: Bedřich Smetana (] ; 2 March 1824 – 12 May 1884) was a Czech composer who pioneered the development of a musical style which became closely identified with his country's aspirations to independent statehood.
i don't know