Laus Deo! The Worcester collection of sacred harmony : In two parts. Containing, I. An introduction to the grounds of musick: or, Rules for learners. II. A large number of celebrated psalm tunes, from the most approved authors. Suited to all metres usually sung in churches. : To which is added, an appendix. Containing a number of excellent psalm tunes, (several of which are entirely new) and other pieces of sacred vocal musick, many of which were composed by eminent European authors, and never before published in this country. : The whole compiled for the use of schools and singing societies. : [One line from Psalms].