In Western countries a vast amount of music was written for Christian worship in churches and cathedrals. This is called “sacred” (religious) music. All other music is “secular” music. The word “secular” means things that are not sacred. Sacred and secular music have influenced one another in many ways during the course of music history. Secular music was largely influenced by dance, and this in turn changed the style of scared music. For example: the church music of the 16th century composer Giovanni da Palestrina has nothing to do with dance music, but both the sacred and secular music of Johann Sebastian Bach two centuries later is full of dance rhythms. At some times in music history there have been different styles of composing for sacred and for secular music. Claudio Monteverdi uses two different styles for his church and for his non-church music. When composers were experimenting with new ways of writing music they usually did this with secular music, and sacred music caught up later.