After 1600 style of motet changed significantly. The acapella style faded and solo voices came into use with instrumental accompaniment. But both styles (old-
In Germany there were two composers to signalise the beginning and the end of baroque motet flourishment . Heinrich Schutz (1585-
In France, the most important representatives of the Motet was Charpentier (1643-
Motets in England were called anthems.
After Bach Motet declined, although some works were composed by later composers (Mendelssohn, Schumann, Brahms).
Willi Apel, motet, Harvard dictionary of music, second edition eighth printing