Jan Campanus (also known as Jan Campanus, 1579–1623) was a notable figure in the early Baroque music scene, hailing from the region of present-day Poland. He was primarily a composer and music theorist, recognized for his contributions to sacred music. His work often blended the styles of Renaissance polyphony with emerging Baroque elements, showcasing both complexity and emotional depth. One of his notable works includes "Cantiones," a collection of sacred songs that exemplifies his innovative approach to choral writing. Campanus's compositions often featured intricate counterpoint and rich harmonies, reflecting the transitional phase of music during his lifetime. His impact on music is significant, as he helped pave the way for later Baroque composers by demonstrating the potential for emotional expression within choral settings. Moreover, his theoretical writings contributed to the understanding of music theory during a time of rapid change in musical styles. While not as widely recognized as some contemporaries, Campanus's work remains an important part of the evolution of Western sacred music, influencing future generations of composers in both Poland and beyond.