José Antonio Carlos de Seixas (1704-1742) was a notable Portuguese composer and musician of the Baroque era. Born in Lisbon, he is recognized as one of the most significant figures in Portuguese music history. Seixas was primarily known for his compositions for keyboard instruments, particularly the harpsichord, and he is often considered a precursor to the classical style that emerged in the later 18th century. His notable works include a collection of sonatas, many of which exhibit intricate counterpoint and harmonic innovation typical of the Baroque period. His "Sonatas for Harpsichord" are particularly esteemed, showcasing his ability to blend Portuguese folk elements with the broader European musical trends of his time. Seixas's impact on music lies in his role as a bridge between the late Baroque style and early Classical music, influencing subsequent generations of composers in Portugal and beyond. His works remain an essential part of the repertoire for keyboardists interested in Baroque music, highlighting the rich cultural heritage of Portuguese classical music. Despite his relatively short life, Seixas’s contributions have earned him a lasting place in the history of Western classical music.