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Title page of La Forme des prières et chantz ecclésiastiques (Geneva, 1542).
Guillaume Franc (c. 1505–1571) was a French musician and composer active in Geneva and Lausanne in the mid-16th century. He is regarded as instrumental in the development of both the Genevan Psalter and the Lausanne Psalter. Some of the melodies are still used in hymns in the 21st century.