The episode's musical performances were given a better reception than the episode as a whole, though there were some dissenting voices, and not every song was received with the same enthusiasm. Slezak described the episode as "jam-packed with terrific song-and-dance numbers", and Votta wrote that "the musical numbers themselves were strong, fantastical and poignant to the story". Amy Reiter of The Los Angeles Times declared, "The music was good; the dancing, better." Chaney wrote that "too many" of the musical numbers were "weak imitations", which was reflected in her grading: her median grade for the nine numbers was a "C+", and her highest grade was a single "B+".
The first song was "Wanna Be Startin' Somethin'", which Bell said "was a fun homage to Michael Jackson, and it set the tone for the rest of the episode". Futterman said that Blaine's "slick showmanship" made him a "natural for lead vocals", and Slezak called it "the best use of Darren Criss' voice on Glee in quite some time" and gave it an "A−". Lynch also gave it an "A−", and said Criss "captured the excitement and the spunky bravado of the original". Sullivan was another fan of "the sheer awesomeness of Darren Criss" on the song, and characterized it as "a tribute that's more respectful than any other in the episode". Chaney dissented from the general approval; she gave it a "C+" and wrote that "the number was appropriately big and splashy, but musically, it sounded like all the funk had been drained right out of it". She described "Bad" similarly as she gave it a "C−": "this tune also sounded noticeably defunkified". Sullivan was also unimpressed; he wrote that the performance let "the world know what 'Bad' sounds like after it's drained of every ounce of danger". Lynch gave it a "B" and wrote that "as silly as a choreographed gang fight between teenagers in a parking lot sounds (and was), the choreography was crisp and the attitude was a lot of fun". Slezak also praised the fight choreography, and stated that he "got chills" when Santana sang the chorus, and gave the song a "B+". Futterman noted the "interesting twist" in the song's arrangement "thanks to the Warblers' penchant for a cappella", and said that "Artie and Santana" began their battle for "vocal MVP of the episode" with "Bad". Votta described the number as "up there with the Dreamgirls performance from earlier this season as one of the strangest and best things Glee has done".
Kevin McHale's performance as Artie in "Scream" inspired several reviewers, including Kate Stanhope of TV Guide and Bell, to write of their regret that McHale could not dance more often on the show. Reiter called him "a sorely underused Glee resource" and called the number "the best dance moment" of the episode, and Bell declared, "I have one word for this number: Epic." Flandez called it a "phenomenal job", and Stanhope cited "killer performances" by McHale on this number and others as evidence that with Artie only a junior "there is life" in New Directions after McKinley's current seniors graduate. Lynch called the number "awesome" and gave it an "A+", and Goldberg described it as "a perfect example of what the show looks like when it's firing on all cylinders"; both reviewers praised the dancing of both performers. Chaney wrote that the performance "lacked the energy and genuine aggression of the original Michael/Janet Jackson collaboration, although at least Kevin McHale and Harry Shum Jr. got to show off their dance skills", and gave it a "C". She felt that "Never Can Say Goodbye", to which she gave a "B−", "worked much better than every track that preceded it" because it adapted the song to the show "instead of trying to out-Jackson Jackson". Lynch called it "a nice summation of her character's journey, but not vocally impressive enough to justify listening to outside of the episode" and gave it a "B". Bell described it as a "blah performance", but Stanhope said it was "sweet and reflective". Futterman wrote that it was "a tune well-suited for Quinn's sultry voice and the flipped meaning she gives the lyrics", and Slezak had a similar take: he gave it an "A" and called it a "remarkably lovely fit" for her voice.
Votta and Futterman both said that Sam and Mercedes sounded "great together" on "Human Nature", and Futterman also complimented their individual voices—"hers restrained and soulful, his rock-tinged and raw"—and summarized, "It's a crisp, well-executed cover". Most other reviewers also noted how good their voices sounded together, including Chaney, who gave the song a "B−", and Bell, who called their harmonies "out-of-this-world amazing". Lynch and Slezak each praised the tenderness in Riley's vocals; Lynch gave the song an "A", and Slezak an "A−". "Ben", however, received far more mixed commentary, and several reviewers felt it was odd to, as Chaney put it, sing a song about a rat "to a guy who isn't named Ben and was wearing an eye patch", which Futterman called "a little creepy" and VanDerWerff, more bluntly, "fucking weird". Despite this, Chaney gave the song a "B", one of her highest grades of the night, in part because it gave Colfer "an excuse to hit those 'You’ve got a friend in me' high notes", while Futterman noted that he "does well in the high range", and praised the verses by Rachel and Finn. Bell, however, called the song "a snooze-fest", and Slezak was very unhappy with the "interminable rendition" which he graded a "D". In December 2012, TV Guide listed the rendition as one of Glee's worst performances.
"Smooth Criminal" was the most highly praised number of the night. Both Slezak and Lynch gave it an "A+": the former called it "an instant Glee classic" that "had me on the edge of my musical chair from start to finish", and Lynch wrote, "Santana declared herself the winner, but the actual victors were 2Cellos, the real-life Croatian cellists whose manic intensity stole the scene." Slezak was similarly impressed by 2Cellos—"this was really a duet between Santana and those amazing black cellos"—and Futterman called them "furiously awesome" and said of the song, "It's the perfect soundtrack for the show's slickest villains: Santana wails, Sebastian channels his Chuck Bass and we are sold." Bell described it as "easily one of the best performances of the night" and added "Santana was flawless". Chaney dissented from the acclaim with a "D" grade.
Slezak described the duet of "I Just Can't Stop Loving You" as "really pretty", and Chaney said that "Lea Michele ... sang this Jackson love song in the loveliest possible fashion with Cory Monteith". Votta wrote that "Finn sounds the best he's sounded", and Futterman noted that Finn held "his own against Rachel, vocally"—she liked the fact that it was Finn singing to Rachel instead of the usual other way around and was "grateful to the Glee team for assigning plot-relevant songs". Lynch felt that the song "seemed to slow down the otherwise wonderfully paced episode" and would have preferred it if they had cut the song and "kept the Warblers' version of 'I Want You Back' instead". He was more enthusiastic about "Black or White", which he characterized as "musically awesome but dramatically confusing" and graded an "A−". Futterman said that "Artie once again nails the MJ impression", and Goldberg declared that the "chorus with Santana leading charge and Artie's rap" were "spot on". Bell agreed that the song showed that "Artie is still New Directions' go-to rapper", but noted that she did not feel that New Directions had successfully demonstrated that they "knew the true meaning of Michael Jackson". Chaney was unenthusiastic and gave the song a "C", while Flandez had more negative opinion than hers: "Sebastian Smythe got our reaction right: a slow-handed clap".
