William Byrd (c. 1540–1623) was an English composer of the Renaissance period, primarily associated with the genres of choral and vocal music. He is renowned for his contributions to both sacred and secular music, and he was a key figure in the development of English polyphony. **Notable Works:** - **"Mass for Four Voices"** and **"Mass for Three Voices"**: These are among his most significant sacred compositions, showcasing intricate counterpoint and harmonic richness. - **"The Great Service"**: A setting of the Anglican liturgy that is notable for its grandeur and complexity. - **"Psalmes, Sonets, and Songs of Sadness and Pietie"**: A collection of secular vocal music, including some of the earliest published English madrigals. **Impact on Music:** Byrd's music had a profound influence on the development of English choral music and the Anglican tradition. He was a pioneer in the