Alois Hába (1893–1973) was a Czech composer and music theorist, primarily associated with avant-garde and modern classical music. He is best known for his pioneering work in microtonality, where he explored scales and intervals beyond the traditional Western tuning system. His compositions often incorporated the use of quarter tones and other microtonal systems, reflecting his belief in expanding the harmonic language of music. Notable works include the opera "Matka" (Mother), various chamber works, and his "String Quartet No. 1," which exemplify his innovative approach to tonality and rhythm. Hába's contributions to music theory include significant writings on microtonality and the development of new scales, influencing a generation of composers interested in non-traditional tuning systems. Throughout his career, Hába aimed to redefine musical expression, often blending folk elements with contemporary techniques. His impact on music can be seen in the broader acceptance of microtonal music and its integration into various genres, inspiring composers such as Harry Partch and Iannis Xenakis. Overall, Alois Hába remains an important figure in the evolution of 20th-century music, particularly in the realm of microtonal composition.