In the 19th century people from different churches met at Camp Meetings. These were led by Evangelists. The songs reflect the belief that sinners can be saved by repenting. The music of black people and of folk music became important influences. Songs became tuneful and often had refrains. In the middle of the century Sunday Schools for children became extremely popular and many songs were written for them. Gospel songs and negro spirituals also became very widely used and influenced the development of church music in America.