Karel Boleslav Jirák (1899-1972) was a Czech composer and conductor known for his contributions to classical music, particularly in the realm of symphonic and choral works. He was associated with the genres of orchestral music, choral compositions, and chamber music. Jirák studied at the Prague Conservatory and later became a prominent figure in Czechoslovak music. Notable works include his symphonies, chamber music, and choral pieces, with his "Symphony No. 1" and various choral settings being particularly recognized. His impact on music lies in his ability to blend traditional Czech musical elements with modern compositional techniques, influencing the development of Czech music in the 20th century. Jirák also contributed to music education and served in various academic roles, helping to mentor future generations of musicians.