Music can be categorized into different genres based on the composer's intentions and how the music is used. Some of the main genres include vocal music composed for the human voice without accompaniment, instrumental music played solely with instruments, and vocal and instrumental music that combines both. Other genres are religious music for liturgical or non-liturgical purposes, profane music for entertainment rather than religion, and functional music to provide backing for events. Additional genres are cinematographic music for film soundtracks, dubstep which has roots in other electronic styles and uses heavy bass, and advertising music used to promote products through suggestive music and images.