Zdeněk Fibich (21 December 1850 – 15 October 1900) was a Czech composer of classical music. Among his compositions are chamber works, symphonic poems, three symphonies, at least seven operas (the most famous Šárka and The Bride of Messina), melodramas including the substantial trilogy Hippodamia, liturgical music including a mass - a missa brevis; and a large cycle (almost 400 pieces, from the 1890s) of piano works called Moods, Impressions, and Reminiscences. The piano cycle served as a diary of sorts of his love for a piano pupil.
Fibich was the original composer of the tune for “My Moonlight Madonna” for which Paul Francis Webster wrote the English lyrics. In 1933 the tune was popularly harmonized by William Scotti.

Josef Suk (4 January 1874 – 29 May 1935) was a Czech composer and violinist, one of the founders of Czech modern style. Suk’s Czech-style influence (originating from being Dovářk’s pupil) eventually slowly became more German and Austrian in style. Morbidity was always a large factor in Suk’s music. For instance, he wrote his own funeral march in 1889. Ripening, a symphony, was also a story of pain and questioning the value of life. However, many of his worksalso represent his happiness, such as the music he set to Julius Zeyer’s drama Radúz a Mahulena. 
Suk said of himself: “I do not bow to anyone, except to my own conscience and to our noble Lady Music… and yet at the same time I know that thereby I serve my country, and praise the great people from the period of our wakening who taught us to love our country.”

Jaroslav Ježek (September 25, 1906 – January 1, 1942) was a Czech composer, pianist and conductor, author of jazz, classical, incidental and film music. 
The first part of his work consists of chamber, piano and concertant compositions, later he also became a popular jazz composer in pre-war Czechoslovakia. He composed songs and dances for the revue plays of the Prague Free Theatre and also for the films of Voskovec and Werich. 
Between 1929 and 1936, possibly earlier, he organized and conducted an orchestra featuring his original jazz compositions and arrangements. Billed variously as “Ježek’s Jazz” and “Ježkův swingband” they recorded for the Czech Ultraphon label, making some of the most original music in Europe.His innovative melodies are well known in the Czech Republic to this day. 

(via get-to-know-cz)