Tough puzzle. Not even the presence of both my Dad (see yesterday) and one of my brothers could help today. My brother is a chemist, and I thought that he might be able to help with 21A: Neighbor of Telescopium (ARA). He did help, I guess, by telling us that Telescopium is not an element. Turns out it's a "minor southern constellation created in the 18th century by Nicolas Louis de Lacaille, a French astronomer and student of the southern skies. Its name is a Latinized form of the Greek word for telescope. It was created in honor of the telescope's invention." You wanna know what I find most interesting about that? "It was created..." Because, really, that's all they are - just creations. Utterly meaningless creations. And this one (they've got a map on Wikipedia, whence I drew that quote) looks nothing like a telescope. If you were going to go so far as to create a constellation in honor of the telescope's invention, wouldn't you pick stars that kind of made a long rectangle?
OK. Sorry. I just had to get that out of my system. ARA, by the way, is one of the constellations described by Ptolemy, so it, at least, has some street cred.
Tried freeMARKET first for OPENMARKET (15A: Its prices are determined by competition), which slowed us down a bit, but BENJI (7D: Dog star) still fit, and I put it right in. After nothing else came to us in the whole NE, I took both answers out, and we started over completely from scratch in that area.
EDDIEMONEY (60A: "Two Tickets to Paradise" singer) was, sadly, one of the first certain gimmies. I would have been happier to come up with the 38A: 1978 Punk classic (IWANNABESEDATED) first, but I was stuck running through the entire catalogs of The Sex Pistols, The Clash, and even Elvis Costello. Finally, once "I Wanna B..." appeared, Frannie and I said the title in unison. All we can say in our defense is that "DDT did a job" on us...
PERMANENTRECORD (39A: Transcript, e.g.) could have been clued with something like "I hope you know that this will go down on your ____," and we could have had a real nice Punk theme going.
I thought 61A: Domino getting played (FATS), was a bit of a stretch, but I loved the next musical clue 62A: They take up some measures (RESTS).
It was a tough, slow, slog, but in the end, it was satisfying to finish, even though it took a couple of tries, because the string of letters ATOMEGOYAN (35D: "Chloe" director, 2009) is a complete mystery to me. I don't know if it's one name or two, and if it's two, I have no idea where to split it up. We got hung up on the OBE (56A: Honor for Harry Potter's creator: Abbr.) cross, first trying "D" and then "K," because, well, why not? Call it a DNF if you want, it's all the same to us.