1.A twist on a popular Les Miserables song, with 29-Down, 99-Across, and 51-Across, that suggests what the circled letters mean in relation to the answers they blend into
6.Informer
9.U.S. gov't agency overseeing air travel
12.Stick of butter
15.Roughly in this vicinity
17.Smartphone software
18.Look fixedly without blinking
20.Produce such as berries
22.Soft infant shoe
23.Regular at the drive-thru, informally
26.Michaels, Saturday Night Live creator
27.Common filler words in speech
28.St. Louis time zone: Abbr.
30.Graduate, casually
31.Steer a ship
33.Sold-out show ticket situation
34.Female rabbit or hare
35.A great deal
36.Soapsuds
37.Knockout outcome abbreviation
38.Intense anger
39.Actor's signal to begin a line
40.Realm dissolved by Napoleon in 1806: Abbr.
42.Core meaning
46.Fruit rinds
48.Includes
49.Not difficult
51.Perform music vocally
52.Tiny spot
53.Having three aspects
55.Largest professional org. of physicians
58.What the circled letters, and the cast of Les Miserables, did on opening night
59.Constructed
62.Vietnamese American actress Kelly Marie
63.High-minded
65.Learn the facts
69.Like aspirin or ibuprofen: Abbr.
70.Metamorphic rock
72.British bathroom
73.Tavern area
75.Fed. agency regulating firearms
78.River-dwelling mammal
81.Rio carnival dance
83.Handed out
84.Mislead or deceive
87.Who Cosette sings "Castle on a Cloud" to
88.Personal finance author Suze
89.Exclamation of mockery
90."___ for Adventure": 1950s TV series
92.1960s stylish and contemporary
93.Dogpatch cartoonist
97.Orlando Bloom's Legolas character
99.Great founding phrase of the USA: "We _", see also 1-Across
101."Westworld" actress Thompson
102.Terrible fate
104."Don't Know Why" singer Jones
105.1200 on a monument
108.Owns or possesses
109.Climbing aid for Clooney, Bale, Affleck and Pattinson?
111.Genetic messenger molecule
113.High school formal
114.Box in a ring
116.Observe carefully
117.Final resting places, often ornate
120.Slouchy crescent-shaped handbag
124.Deer known for its bugling call
125.Recognizes from a lineup
126.British honor: Abbr.
128.Dismissive cry
129.Spring from a cause
131.Remain
133.Flushed with embarrassment
134.More or less
135.1994 Immature hit
138.Singer Celine
139.Garden legume
140.Common website section
141.Positioned behind, in archaic phrasing
142.Way back when
146.Bring a horse to a stop
149.Harry Potter Weasley girl
150.Gradually wear down
151.Decay
152.Ballerina, perhaps
153.Shiny discs replaced by streaming
154.Thesaurus abbr. opposite of ant.
155.Possessive form
156.Witherspoon, 'Legally Blonde' actress