Earlier today, I was emailed the following C.S. Lewis quote regarding novelty in worship. It's good stuff, although the sender couldn't site the book from whence it came. Sounds awfully like an inadvertent endorsement of the Regulative Principle for Worship.
"Is this simply because the majority are hidebound? I think not. They have a good reason for their conservatism. Novelty, simply as such, can have only an entertainment value. And they don't go to church to be entertained. They go to use the service, or, if you prefer, to enact it. Every service is a structure of acts and words through which we receive a sacrament, or repent, or supplicate, or adore. And it enables us to do these things best—if you like, it 'works' best—when, though long familiarity, we don't have to think about it. As long as you notice, and have to count, the steps, you are not yet dancing, but only learning to dance. A good shoe is a shoe you don't notice. Good reading becomes possible when you need not consciously think about eyes, or light, or print, or spelling. The perfect church service would be one we were almost unaware of; our attention would have been on God."
HT: John Thomson and Jim Gamble