Heavens, there's a THIRD melody for "Der Erlkönig"? (Actually, maybe it's the first.) Too bad my computer can't play it. I hate to keep being pedantic (I'm lying), but don't take "The Elf-King" on faith as the correct translation. You can apparently make as good a case for "The Alder King" or for leaving it untranslated as "The Erl King". (Possibly related to a Duke?)

On Bryn Terfel's excellent album of Schubert lieder, An die Musik, he does this song with a remarkable scary, nasty Erl King voice.

The album Tales of Mystery and Imagination was by the Alan Parsons Project, in that interestingly produced '70s style that Parsons didn't do quite as well as some others.