This mediaeval polyphonic music, although the most complete example in art of the perfect adaptation of means to a particular end, could not long maintain its exclusive prestige. It must be supplanted by a new style as soon as the transformed secular music was strong enough to react upon the Church. It was found that a devotional experience that was not far removed from spiritual trance, which was all that the old music could express, was not the only mental attitude admissible in worship. The new-born art strove to give more apt and detailed expression to the words, and why should not this permission be granted to church music? The musical revolution of the seventeenth century involved the development of an art of solo singing and its supremacy over the chorus, the substitution of the modern major and minor transposing scales for the Gregorian modal system, a homophonic method of harmony for the mediaeval polyphony, accompanied music for the _a capella_, secular and dramatic for religious music, the rise of instrumental music as an independent art, the transfer of patronage from the Church to the aristocracy and ultimately to the common people. All the modern forms, both vocal and instrumental, which have come to maturity in recent times suddenly appeared in embryo at the close of the sixteenth or early in the seventeenth century. The ancient style of ecclesiastical music did not indeed come to a standstill. The grand old forms continued to be cultivated by men who were proud to wear the mantle of Palestrina; and in the eighteenth and nineteenth centuries the traditions of the Roman and Venetian schools of church music have had sufficient vitality to inspire works not unworthy of comparison with their venerable models. The strains of these later disciples, however, are but scanty reverberations of the multitudinous voices of the past. The instrumental mass and motet, embellished with all the newly discovered appliances of melody, harmony, rhythm, and tone color, led the art of the Church with flying banners into wider regions of conquest, and the _a capella_ contrapuntal chorus was left behind, a stately monument upon the receding shores of the Middle Age. [Note. A very important agent in stimulating a revival of interest in the mediaeval polyphonic school is the St. Cecilia Society, which was founded at Regensburg in 1868 by Dr. Franz Xaver Witt, a devoted priest and learned musician, for the purpose of restoring a more perfect relation between music and the liturgy and erecting a barrier against the intrusion of dramatic and virtuoso tendencies. Flourishing branches of this society exist in many of the chief church centres of Europe and America. It is the patron of schools of music, it has issued periodicals, books, and musical compositions, and has shown much vigor in making propaganda for its views.