Arcangelo Crivelli (c. 1450–c. 1500) was an Italian composer and music theorist from the Renaissance period, primarily associated with the genre of sacred music, particularly polyphony. He was active in the late 15th century, a time when the transition from medieval music to the more complex textures of the Renaissance was underway. Crivelli is best known for his motets, which exhibit intricate vocal lines and rich harmonies, showcasing the evolving styles of the period. His notable works include "O Maria," a setting of the Marian antiphon, and several pieces that reflect the influence of his contemporaries, such as Josquin des Prez. His contributions to music theory, particularly in the realm of counterpoint, were significant, as he wrote about the practices of the time, helping to codify the techniques that would later be central to Western classical music. Though not as widely recognized as some of his contemporaries, Crivelli's work laid groundwork for subsequent composers, influencing the development of choral music throughout the Renaissance and beyond. His focus on text setting and emotional expression can be seen as a precursor to the more elaborate styles of the later Baroque period.