"The directors who preceded Bach at Leipsic used to choose the cantatas or motets to be sung in the churches quite arbitrarily, without any regard to their connection with the rest of the service. But Bach felt that unless these elaborate pieces of music were really made a means of edification, they were mere intellectual pastimes suitable for a concert, but an interruption to divine worship; and he thought that they could best edify the congregation if their subjects were the themes to which attention was specially directed in the service and sermon of the day. He therefore made it a rule to ascertain from the clergymen of the four churches the texts of the sermons for the following Sunday, and to choose cantatas on the same or corresponding texts. As most of the clergy were in the habit of preaching on the Gospel of the day, the service thus became a harmonious whole, and the attention of the congregation was not divided between a variety of subjects. The clergyman of highest standing at Leipsic, Superintendent Deyling, a preacher of great eloquence and theological learning, co-operated heartily with Bach in this scheme. A series of cantatas for every Sunday and festival for five years--about three hundred and eighty in all--was composed by Bach, chiefly during the first years of his stay at Leipsic. Unfortunately many of these are lost; but one hundred and eighty-six for particular days, and thirty-two without any days specified, still remain. Their music is so completely in character with the subject of the words as to form a perfect exposition of the text. In some the orchestral introductions and accompaniments are made illustrative of the scene of the text; as for instance in one on Christ's appearing to His disciples in the evening after His resurrection, the introduction is of a soft, calming character, representing the peacefulness of evening and of the whole scene. Another, on the text 'Like as the rain and snow fall from heaven,' is introduced by a symphony in which the sound of gently-falling rain is imitated. In others the instrumental parts and some of the voices express the feelings excited by meditation on the words. Sometimes, in the midst of a chorus in which the words of the text are repeated, and, as it were, commented on, a single voice, with the accompaniment of a few instruments, breaks off into some well-known hymn in a similar strain of thought or feeling."