So...It's possible I overreacted.
This morning, I listened as an online radio station played a decent acoustic cover of "Lovefool" by The Cardigans. The station doesn't post its playlist online, and I listened for a while without hearing a live announcer. I did a search for possible song matches and listened to samples of various renditions without finding the one I'd heard. Near the end of the last version I heard, I exclaimed, "WHO SANG THAT VERSION OF 'LOVEFOOL' THAT I HEARD EARLIER?!!!"
Inexplicably, shouting failed to produce an answer from the heavens. When you're accustomed to finding so many of the answers you need through search engines, it's vexing to come up dry. I guess, unless I stumble on the answer elsewhere, I'll just need to stick with the original--and admittedly best--version.