What does a worship leader do?

Bob Kauflin, Director of Worship Development for Sovereign Grace Ministries, offered a profound, reformed definition of worship leader:

An effective corporate worship leader,
aided and led by the Holy Spirit,
skillfully combines biblical truth with music
to magnify the worth of God and the redemptive work of Jesus Christ, thereby motivating the gathered church
to join him in proclaiming and cherishing the truth about God
and seeking to live all of life for the glory of God.

He then carefully unpacks the above definition in 17-part short posts here, which I think is a must-read for every worship leader. You can opt to listen to his message and download.