Institute for Christian Worship Lectures
The Institute for Christian Worship at The Southern Baptist Theological Seminary has its lectures available online. I remember being particularly impressed with Timothy Dudley-Smith when he was on campus during my seminary days. His lecture, “Words for Worship,” is available on the site.
Reformed Praise presents Martin Luther's setting of Psalm 130 in a fresh, reflective, piano-driven setting suitable for a wide range of worship music styles.
There are also some great lectures from Kevin Twit, Bob Kauflin, and others.