I got to see their concert yesterday, with openings by the lead of a group now long gone, Burlap to Cashmere, and a Christian folk group known as Caedmon's Call.
It was an acoustic guitar showcase, and should not be missed if they come through your area.
The first artist, Steve Delopoulous (a Greek man with a name too long to recall accurately), took time to do a couple of tunes on his own, and one extra with the only electric guitarist of the night - Andy of the aforementioned Caedman's Call - which used the electric guitar solely because it had a whammy bar and his guitar didn't. The first artist's guitar work is interesting, if only because he will change between individual plucking of strings at a somewhat rapid rate and strumming so fast I'm surprised he has *skin left* about eight to ten times a song. The man can play an acoustic guitar, but some may prefer something more conventional.
Caedmon's call has an interesting percussion setup. They run normally with two percussionists - the first keeps mostly to his drum set, though at one point he brought out a tambourine and hit the thing with his stick. (This seems to me to be a quick and dirty path towards needing new drumsticks. Hitting a tambourine is what a thigh, or, if microphones do not permit such, your other *hand* is for.) The other drummer was what is called an auxillary percussionist; he had a drum set available, but I didn't catch him using it. He had a set of small high-hats, a set of small gongs, his choice of other doo-dads, and a large kettle drum that, when miked, makes the chests of those standing right in the front of the stage vibrate. (...such as mine. ^________^ )
Then, of course, Jars of Clay. The set included choices from a hat - here, they were "Frail", "I'm Alright", and "Revolution", and I can't argue with those choices all that much. Of course, there were choices from their new CD, who we are instead. Of note are "Amazing Grace", which is *completely different* from the song everyone who has seen a church in the past decade (or, alternately, Star Trek II) is familiar with.
More importantly, Jars of Clay played without an electric guitarist.
They had their acoustics plugged in, and had a percussionist and a piano/accordion player available, as well as something with strings that you sat down to play (an electric mandolin?!?) that was much plucked and had notes held for ambience when needed. Still, it was an acoustic show, and these guys can play acoustic guitars and harmonize.
You'll need to have Flash to see their site, but it's got the concert dates and the set list right there for viewing. Go see.