Dr. Gordon hits the nail on the head in a recent post he authored about the modern "Praise Band" phenomenon. Here's a snippet:
I note that many defenders of the present liturgical model have coined the expression “contemporary worship music.” They did not call it “contemporary congregational praise,” and they really could not have done so, since it is evident that the current practice actually makes it difficult for the congregation to sing robustly since no musical score is provided and difficult even to hear them if they do. But the Scriptures do not command “worship music;” they command congregational praise. So even the label here is mildly misleading. If we required people to use the expression “contemporary congregational praise,” we would, in doing so, require them to do those things that enhance such congregational praise, and require them not to continue doing those things that worsen it or hide it.
You can read Dr. Gordon's entire post here.