Happy Halloween! 🎃🎸👻🥁🦇🎵💀🎹 I thought it might be fun to celebrate with a concert, so this puzzle's theme entries are all appropriately-named bands who are putting on a Halloween show for you. I'm sure something like this has been done before, so rather than scouring lists of relevant band names, I stuck to whatever came to my mind from the bands that I know of. Sure, not all of them are widely known (and at least one of them is really obscure, although that one's my favorite of the bunch by far), but I think I put enough hints in the clues that you'll be able to suss everything out. You'll notice several other answers and clues pertaining to music, as well, to go along with the main theme. In other news, the most recent Sunday puzzle (10/24) over at The Atlantic is mine! Check it out on their site where it will be available for the next week only. (I believe it disappears two weeks after publication date, unless you have an Atlantic  subscription.) Although...

  Huzzah, a full-sized, themed puzzle! I tend to post mostly midi-size puzzles on here, but I doubt there's really a good home elsewhere for this particular puzzle. As the title indicates, you will be well served by any prior knowledge of physics, science, and mathematics, but you don't need  any such expertise to solve the puzzle. It would just really help because, in addition to the theme answers, I peppered the fill with plenty of science-related entries and clues. (In particular, [spoiler alert] you may want to look back to this post about my puzzle on 7xwords for more info about one entry in this puzzle.) You may also notice one blemish of asymmetry here: there's an extra black square just to the left of where 66-Across begins. I didn't need  to add this to make the grid fillable at all, but I did need it to make the entries in that corner more reasonable and science-related. I'm hoping that, like me, you either won't care/notice at all, or you'll thin...