I now have two more covers of Abba's "S.O.S." One perky one by the A*Teens (thanks, bleu_lavande!), and the one I was looking for, which was not at all "soft folk"--it was a much faster and more finger-pickin' country version than I recalled, but I'm pretty sure it's the right one, and it's cracking my shit up. I recommend it to everyone. It's by the Meat Purveyors--I've actually been meaning to follow up with them for years now, ever since I borrowed a coworker's CDs. Must check out some more of their tracks on iTunes.