melodic parts being performed simultaneously. These interweaving melodic lines, a style called polyphony, is one of the defining features of Renaissance music. Blending, rather than contrasting, melodic lines in the musical texture. Harmony that placed a greater concern on the smooth flow of the music and its progression of chords. The development of polyphony produced the notable changes in musical instruments that mark the Renaissance from the Middle Ages musically. Its use encouraged the use of larger ensembles and demanded sets of instruments that would blend together across the whole vocal range. Background As in the other arts, the music of the period was significantly influenced by the developments which define the Early Modern period: the rise of humanistic thought; the recovery of the literary and artistic heritage of Ancient Greece and Ancient Rome; increased innovation and discovery; the growth of commercial enterprises; the rise of a bourgeois class; and the Protestant Reformation. From this changing society emerged a common, unifying musical language, in particular, the polyphonic style of the Franco-Flemish school. The invention of the printing press in 1439 made it cheaper and easier to distribute music and music theory texts on a wider geographic scale and to more people. Prior to the invention of printing, written music and music theory texts had to be hand-copied, a time-consuming and expensive process. Demand for music as entertainment and as a leisure activity for educated amateurs increased with the emergence of a bourgeois class. Dissemination of chansons, motets, and masses throughout Europe coincided with the unification of polyphonic practice into the fluid style which culminated in the second half of the sixteenth century in the work of composers such as Giovanni Pierluigi da Palestrina, Orlande de Lassus, Thomas Tallis, William Byrd and Tomás Luis de Victoria. Relative political stability and prosperity in the Low Countries, along with a flourishing system of music education in the area's many churches and cathedrals allowed the training of large numbers of singers, instrumentalists, and composers. These musicians were highly sought throughout Europe, particularly in Italy, where churches and aristocratic courts hired them as composers, performers, and teachers. Since the printing press made it easier to disseminate printed music, by the end of the 16th century, Italy had absorbed the northern musical influences with Venice, Rome, and other cities becoming centers of musical activity. This reversed the situation from a hundred years earlier. Opera, a dramatic