Later the Calvinism that came to dominate the Scottish Reformation was much more hostile to Catholic musical tradition and popular music, placing an emphasis on what was biblical, which meant the Psalms. The Scottish Psalter of 1564 was commissioned by the Assembly of the Church. It drew on the work of French musician Clément Marot, Calvin's contributions to the Strasbourg Psalter of 1539 and English writers, particularly the 1561 edition of the Psalter produced by William Whittingham for the English congregation in Geneva. The intention was to produce individual tunes for each psalm, but of 150 psalms, 105 had proper tunes and in the seventeenth century, common tunes, which could be used for psalms with the same metre, became more frequent. Because whole congregations would now all sing these psalms, unlike the trained choirs who had sung the many parts of polyphonic hymns, there was a need for simplicity and most church compositions were confined to homophonic settings.