Gospel music is a music genre in Christian music. The creation, performance, significance, and even the definition of gospel music varies according to culture and social context. Gospel music is composed and performed for many purposes, including aesthetic pleasure, religious or ceremonial purposes, and as an entertainment product for the marketplace. Gospel music usually has dominant vocals (often with strong use of harmony) with Christian lyrics. Several forms of gospel music utilize choirs, use piano or Hammond organ, tambourines, drums, bass guitar and, increasingly, electric guitar. In comparison with hymns, which are generally of a statelier measure, the gospel song is expected to have a refrain and often a more syncopated rhythm.