The poly-choral style originated from Venetian school in the 16th century is an important style of development of instrumental music which has affected the Baroque period and the period after Baroque. During the second half of sixteenth-century, the form of double chorus singing has developed to the form of multi- choruses, and the form of multi-choruses accompanied with the instrumental music and the solo vocal music. Details about the poly-choral style, the main development place of Venetian school, and Saint Mark cathedral in the second half of sixteenth-century, from Claudio to Mondeverdi, would be the focus of this study (thesis).

The thesis includes four chapters. The first chapter discusses the origin of poly-choral style, including historical background on the tradition of psalms singing. The second chapter focuses on Renaissance time at Venice, and discusses the politics, artistic, glass craft, mosaic art synopsis at that time. The third chapter discusses poly-choral music of Venetian school in the early times of 16th century, and main composers of Venetian school including: Andrian Willaert, Andrea Gabrieli, Giovanni Gabrieli, and Claudio Monteverdi in early time of Baroque period. The fourth chapter discusses poly-choral works, the effects of the acoustics “stereo sound”, questions of chorus establishment, textures, and questions of annotation and questions when conducting these pieces based on the discussion and summary from the previous three chapter.