I mean like... If there's a 10x10 flat ground. And there is only a jukebox. You can't see any redstone. Is that possible? Like 10x10 flat grass ground and a jukebox. No visible redstone at all..
Hmm...I made one of these jukebox-triggered doors on our SMP server a while ago, as part of a puzzle.
There may well be a suitable piston BUD for this, but I used a redstone signal range-limit BUD, wired as a monostable circuit, and hooked that into a TFF controlling a secret door in an adjacent chamber.
My jukebox is level with the floor, though. The BUD's sweet spot is elevated. I think the current would still get cut off with a floor below this kind of BUD, unless you used transparent blocks for the floor (useless!) but you might be able to finagle it with a repeater. Maybe a hybrid BUD, since redstone updates can trigger BUDs 2 blocks away...