I listened (for several seconds) a few years ago to Folk Alley. It would appear that their definition stretches to "anyone who once knew someone who had a cousin who once lived next door to someone who once had an acoustic guitar". Nothing (usually) actually wrong with it, but you can hear pop music anywhere.

Just tried (tentatively) again at the link shown above. As Steeleye's New York Girls was currently being played, I'm really exceptionally glad it didn't work.