Certainly no other religious institution has come so near the solution of the problem of the proper use of the instrumental solo in public worship. Through the connection of the organ music with the people’s hymn in the choral prelude, and the conformity of its style to that of the choir music in motet and cantata, it became vitally blended with the whole office of praise and prayer; its effect was to gather up and merge all individual emotions into the projection of the mood of aspiration that was common to all.
The work performed by Bach for the church cantata was somewhat similar in nature to his service to the choral prelude, and was carried out with a far more lavish expenditure of creative power. The cantata, now no longer a constituent of the German Evangelical worship, in the eighteenth century held a place in the ritual analogous to that occupied by the anthem in the morning and evening prayer of the Church of England. It is always of larger scale than the anthem, and its size was one cause of its exclusion in the arbitrary and irregular reductions which the Evangelical liturgies have undergone in the last century and a half. There is nothing in its florid character to justify this procedure, for it may be, and in Bach usually is, more closely related to the ritual framework than the English anthem, in consequence of the manner in which it has been made to absorb strictly liturgic forms into its substance. Bach, in his cantatas, kept the notion of liturgic unity clearly in mind. He effected this unity largely by his use of the choral as a conspicuous element in the cantata, often as its very foundation. He checked the Italianizing process by working the arioso recitative, the aria for one or more voices, and the chorus into one grand musical scheme, in which his intricate organ style served both as fabric and decoration. By the unexampled prominence which he gave the choral as a mine of thematic material, he gave the cantata not only a striking originality, but also an air of unmistakable fitness to the character and special expression of the confession which it served. By these means, which are concerned with its form, and still more by the astonishing variety, truth, and beauty with which he was able to meet the needs of each occasion for which a work of this kind was appointed, he endowed his Church and nation with a treasure of religious song compared with which, for magnitude, diversity, and power, the creative work of any other church musician that may be named—Palestrina, Gabrieli, or whoever he may be—sinks into insignificance.