Sir, how dare you. How very dare you. Hey nonny nonny, folder-oh and Plants garrulous wassailing underpin most of Led Zeppelin's finest moments. How they ever managed to step back from the brink of repopularising morris dancing, I'll never know.
(PS: In all seriousness, Led Zep are the greatest rock band ever.
PPS: A very good friend of mine is a well known Canadian folk rock singer and even SHE thinks folkies in the UK are a bit weird. Blackwater Side is in one of her sets BTW)