Where to find?

I wish I could kiss you.

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Hang onto it... NEVER let it go. It's worth a fortune now that Disney has corporatized yet another previously marvelous institution.
Youtube no longer runs it under either url. "Copyright" dispute. So much for public domain.
I saw clips of it a number of years ago when PBS aired the retrospective of his career. If I remember right, it (the special) may have even been done before he died.
Jim Henson was, is, and always will be at the top of my list of people I would like(d) to (have) me(e)t.
I would also advise grabbing The Muppet Show seasons while you can... it's just a matter of time before they and all the Pixar movies get the vault treatment, too.
To those who didn't "get" the Dark Crystal and Labyrinth I say- "Look up the phrase 'labor of love,' for underneath all the technical advancements in animatronics that came about specifically *because* of those endeavors, and in spite of any/all complications during filming, I'd be surprised if anyone could find one person that didn't ultimately love what they were doing.
I'm just glad that they decided to go with a new storyline, rather than simply redoing the film.
I have no doubt that GT enjoys his craft as much as Jim & Frank and all the rest enjoyed theirs, and will no doubt do justice, as he is also working with Brian Froud.
As for the score, I used to fall asleep to several tracks on the soundtrack, set to repeat. Maybe it was too peaceful & soothing to be appreciated by some folks. That doesn't mean it was bad. One track in particular, I believe it was just before Kira & Fizzgig showed up, was entirely too short.
Of course, I liked "Frogorian Chant," too, which had NOTHING to do with the Muppets. But I think Jim & Kermit would've enjoyed it.