When Christians worship according to a set pattern on a regular basis, for example on a Sunday. There will be setprayers and readings, led by the priest or minister, often using the Book of Common Prayer. The Lectionary contains the list of readings for each day.
Some Christians prefer spontaneity in their style of worship, having no fixednature.Charismatic worship is an informal worship often held by Pentecostal churches. It may involve clapping,dancing and music. It may involve speaking in tongues.
Quaker Christians follow no set pattern of worship or services. Instead, they attend 'meetings' where followers sit in silence. There is no minister / worshipleader — anybody can decide to speak or read.