chained_bear commented on the word mackerel-snapper I get the fish-eater thing, but I don't know why non-Catholics wouldn't want mackerel--evidenced by the use of the term in a disparaging phrase. (Or wouldn't want snapper, for that matter.)
Psalm 1 is the first of the Psalms in the Hebrew Bible. Like many of the psalms, it contrasts the  righteous  person (tzadik ×¦×××§) to the wicked or ungodly (rasha` ×¨×©×¢) or the  sinner  (chatta' ×××).
The Necessity of Reforming the Church (1543) John Calvin 1. in the name of all who wish Christ to reign. Congregational singing began after the Reformation when the Psalms were recomposed to meter. Instruments were removed primarily because they were most often used for secular purposes and not playing an accompanying role under the Catholics.