 Most of those burghs without song schools made provision within their grammar schools.Polyphony was incorporated into editions of the Psalter from 1625, but in the few locations where these settings were used, the congregation sang the melody and trained singers the contra-tenor, treble and bass parts.However, the triumph of the Presbyterians in the National Covenant of 1638 led to an end of polyphony, and a new psalter in common metre, without tunes, was published in 1650.