Our church tries hard to run two identical services, and it's a mix of contemporary Christian and straight-out-of-the-hymnal. Every Christmas and easter we do a fully scored CC show that pumps up the standard lineup to about 21 players. Normally we have bass, guitar (one or two), drums, acoustic piano, organ/electronic strings, electric piano, two violins, two or three trumpets, euphonium, flute & clarinet. We did have a banjo player, but he moved away. Guitar, bass and drums are solid -- two of us came out of the school of rock and the drummer is excellent, a school teacher who plays all styles well. We have been playing together for about six years, and we are locked tight. Having come out of rock, we can adapt if someone skips a verse or drops a few measures, but the other folks are totally dependent on reading and, somewhat ironically, are the ones who get lost most often. Even the music minister, who has a PhD in music, quite often comes in singing too soon or too late ... and refuses to go with the flow, so we have to turn the beat around to follow him.
They used to run a straight contemporary service on Saturday nights (I dodn't play that one) before we went to all-direct, and it was LOUD. Bear in mind that I played 30 years in clubs doing Yes, Deep Purple and Led Zeppelin, and I know what loud is. This band was TOO loud for church. Finally, the Saturday night pastor approached the band and asked then to tone it down. They refused, and the band was gone the next week. The service also shut down, which is a shame. I don't recall the words "excrutiatingly loud" in that passage about "joyful noise." However, I'm reminded of the line in "This is Spinal Tap," when Nigel, after being told that Mozart (or was it Beethoven?) didn't play loud, says "Well, he played as loud as he could!" I'm sure that if King David had had an amp for his harp, he'd have cranked it.