48D48DSign in the stands at a 46 Down, maybe[-----] mistakenly says Across instead of Down, since it is referring to 46D46DBuilding often named after a giant corporation[-----].
Apart from that, awesome puzzle! The revealer is fantastic!
Like every 21 Across21A*3, 5, or 53, but not 35[-----------] except "2"
8A
Poet Ginsburg or musician Toussaint
13A
Philadelphia newspaper (with "the")
15A
Split, as with an axe
16A
Musician ___ Love (Hole, Faith No More)
17A
Banded gemstones
18A
Part of the soc'l safety net
19A
ZIP file alternative
20A
AP exams:US::___:UK
21A
*3, 5, or 53, but not 35
24A
Opposite of close, in poetry
25A
___-Tass (Russian news agency; the first word was dropped in 2014)
26A
VHS successor
29A
Son of Odin
32A
Spot for some preemies
34A
Light ____ (virtually weightless)
36A
*Group established by Congress to investigate the January 6 attack, e.g.
39A
Top Chef's Lakshmi
40A
"___ Kleine Nachtmusik" (Mozart)
41A
Prefix meaning aloft, usually seen with an "o" at the end
42A
Rds.
43A
Greek "philosophy" has two of these
45A
See 35 Down35D"___ by Your [45 Across]" (Tammy Wynette)[-----]
47A
*Profane utterance, colloquially
51A
Reach
53A
Were now?
54A
Low pH acid
57A
Yours might become your bestie if you're lucky
58A
When the Big Bands played
60A
Amazes
61A
Made, as a guess
62A
Starting point of an epic civil rights march
63A
Linguistic suffix
64A
Gov't entity that establishes the standards for 1 Across1AComplaint, colloquially[----], which begin each starred answer
Down
1D
Some pens and lighters
2D
Baseball legend Slaughter
3D
Outfit
4D
Pelt
5D
Snow globe or star, maybe
6D
Last name in farm equipment
7D
Arid
8D
Course in which you might learn to solve the equations xy=12, x-y=1
9D
Depart
10D
At a ______ (some undefined future time)
11D
Daredevil Knievel
12D
Untouchable Eliot
14D
Let ___ (act without restraint)
15D
Smash Spanish-language hit by Perdro Capó ("___, mi vida, con ___/Que nada hace falta si estamos juntitos caminando")
20D
Fall
22D
Pulitzer Prize-winning composer Ned ___
23D
Salade ____ (salad with tuna, eggs, green beans, potatos)
27D
The positive value of "x" in the equations in the clue for 8 Down8DCourse in which you might learn to solve the equations xy=12, x-y=1[--------], to a Frankfurter
28D
The positive value of "y" in the equations in the clue for 8 Down8DCourse in which you might learn to solve the equations xy=12, x-y=1[--------], to a Hamburger
29D
Recipe amts.
30D
Miami's NBA team
31D
Traditional
33D
", Baby" (Vanilla __)
35D
"___ by Your [45 Across]" (Tammy Wynette)
37D
Brazilian martial arts form
38D
Learn by heart
44D
Homes for bees
46D
Building often named after a giant corporation
48D
Sign in the stands at a 46 Down46DBuilding often named after a giant corporation[-----], maybe
49D
Reduplicatively named East Coast convenience stores