I tend to enjoy this kind of jokey wordplay theme. JUMPATTHECHANTS (58A: Be startled by singing monks?), is maybe my favorite, and PRINTSOFTHIEVES (17A: What Ali Baba found on the treasure in the cave?) is my least. It's clever, but wouldn't the treasure be gone?
Decent enough fill, I guess. You've got your OONAs and your OBEs and stuff like POLI and ELEV, but, well, it's fine. The crossing of AIDAN (14A: Actor Quinn) and ADIN (3D: Deuce follower) is interesting, and we've got both GIG (24D: Booking) and GIGI (54A: Lerner/Loewe musical set in Paris), and TMEN (51D: Eliot Ness and others) and TBIRD (31D: Car mentioned in the Beach Boys' "Fun, Fun, Fun"), which is a little weird. Is that kind of thing intentional? or just coincidence? I'm gonna go with intentional.
Favorite clue/answer: 49A: You'll need to take steps to get to it (ATTIC). Nice.
It wasn't my favorite ever, but you won't hear any BOOING from me. A decent Wednesday.