Francisco Guerrero (1528–1599) was a prominent Spanish composer of the Renaissance, known for his mastery of choral music and his contributions to the development of polyphony. Born in Seville, Guerrero was a key figure in the transition from the late Renaissance to the early Baroque period. His works primarily fall within the sacred music genre, with a focus on liturgical compositions. Notable works include his "Missa de la batalla escuchen," "O sacrum convivium," and a series of motets and villancicos that showcase his intricate counterpoint and melodic expressiveness. Guerrero’s music is characterized by its emotional depth and innovative use of harmony, which influenced subsequent generations of composers. His impact on music is significant, as he played a crucial role in the dissemination of the Spanish polyphonic style across Europe. Guerrero spent much of his career in various cathedrals, including the Seville Cathedral, where he contributed to the rich tradition of choral music. His works remain a staple in choral repertoires today, reflecting the religious and cultural milieu of the Spanish Golden Age.