OK, that was fun!
And besides being excellent, they seem to be a fairly fluid, as well; I have now seen 3 vids of them: 1 as a quartet, 1 as a quintet, & 1 as a sextet. According to their website, you can also book them as a trio (no drums or keys) or duo (just guitars).
Hey, Shelby - if you're around here, say hi.
Peter