Bob Kauflin explains why he begins every service with a call to worship:
Every Beginning Says Something
There are different ways of letting people know the meeting is starting. Some churches run a countdown video. Others have the band kick in to the first song (our practice for decades). Some churches find it effective to have some kind of warm up song before the meeting actually starts. They may or may not invite the congregation to sing along. Some churches begin with a friendly welcome by a leader, and other churches open with announcements. But every beginning communicates meaning, sets an atmosphere and leads people to expect something.
The church is the ekklesia, the “called out ones.” When we gather as God’s people we are being called away from other pursuits to worship God together in a specific place and time. We can worship God indirectly as we play soccer through good sportsmanship and serving others. But we worship him more directly on Sunday mornings as we gather to sing, pray, hear God’s Word preached, and share the Lord’s supper.
A call to worship tells us the meeting has begun, but it communicates much more than that. It emphasizes the primacy of God’s Word, who has called us together, and what we’ve come to do.