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Final answer:The earliestpolyphonic musicis calledorganum, which developed during the Medieval period in Western Europe. Organum grew out of adding another voice to Gregorianchantat the interval of a fifth or fourth.Explanation:The earliest polyphonic music, calledorganum, grew out of the improvisation of adding another voice to Gregorianchantat the interval of a fifth or fourth. Organum was developed during the Medieval period in Western Europe and is considered the beginnings of Western classical music.Organum, thus, represented a significant development in the history of music by introducing harmony and multiple voices. This polyphonic style stimulated the creativity of composers, leading to the rich tapestry of Western music we have today.Learn more aboutPolyphonic Musichere:brainly.com/question/29781604#SPJ11...