Thanks to @nazgul for the pointer to Brave Combo, one of the most curious bands I've heard in some time. He describes them as "New Wave Polka", which is as good as any description -- they intentionally flit between a dozen different dance beats, often within the same song. Polka slides into salsa, then over to a bit of swing, and then something rather like klezmer. The linked page has a bunch of YouTube videos of their stuff, which aren't much to look at but give you an idea of their range.
Fun stuff -- I might pick up an album or two.
(Oh, and BTW: the "@foo" notation is Twitter style -- I'll be using it when referring to folks from that side of the blogosphere. I expect that I'll be crossing the lines from one to the other pretty freely, depending on the immediacy and depth of the message in question. Twitter is proving to be appropriate for spur-of-the-moment one-liners that look kind of trivial for LJ; LJ is appropriate when I have more to say than is reasonable for Twitter.)