<P> On November 5, 2013, on the 14th episode from the fifth season of The Voice, Christina Aguilera (one of the competition's coaches) performed "Say Something" with A Great Big World . The performance consisted of a piano, some strings and a keyboard for instrumentation, while Aguilera "reining in her voice's natural power", according to Billboard's Jason Lipshutz . Christina was wearing white t - shirt, jeans and a woolly hat . The performance was lauded by critics and other artists, such as OneRepublic, Christina Perri, Ingrid Michaelson, Cee Lo Green and Carson Daly . Caila Ball of Idolator wrote that, "She was legendary, obviously ." Michelle Stark of Tampa Bay Times wrote the performance "gives us all of the goosebumps ." British newspaper Daily Mail wrote that Christina "gave the competitors a master class in subtlety in her touching duet ." Douglas Cobb of Las Vegas Guardian Express called it "a very emotional, low - key, cool performance . It was a very tender, touching song--Christina did great, as usual, singing it ." Bradley Stern of MuuMuse called the performance "perfect", writing that, "Christina keeps it as stripped as the studio version, allowing her naturally beautiful vocals to sound a whole lot more vulnerable than usual . The result? One powerful, devastating performance--you'll be seeing your reflejo in the tears streaming down your face in no time ." </P> <P> A Great Big World and Aguilera also performed the song at the 2013 American Music Awards on November 24, 2013 . With her hair in a braid and wearing a muted black dress, Aguilera sang an original verse midway through the performance, which included a string section and a fairly bare stage . With A Great Big World's Chad King manning the keyboard, the group's Ian Axel sat at the grand piano and stamped his feet furiously as' Say Something' approached its emotional climax," according to Billboard's Jason Lipshutz . Lindsay Dreyer of Wetpaint wrote that "Taking her rightful place center stage in a floor - length black dress and braided updo, the 32 - year - old pop diva harmonized perfectly with the group's lead singer Ian Axel, who worked the piano with passion and poise . Xtina's rich yet breathy tone offered just the right amount of strength and vulnerability--a side of Christina we haven't seen in a really long time ." Dreyer finished the review stating, "If tonight's AMA performance is any indication, Christina is on the brink of a major music comeback--and we can't wait! ." The band also performed the song at the 2013 Victoria's Secret Fashion Show on December 10, 2013 . However, Aguilera did not perform the song with them as a duet, due to scheduling conflicts of The Voice . Aguilera also performed the song in Malaysia in a private concert without the band on March 28 . The duo and Aguilera also performed the song during the New Orleans Jazz Festival . She gave a one - and - a-half - hour - long show and then invited the band to perform the song in front of a large crowd on May 2, 2014 . The band (sans Aguilera) sang the song on the September 6 episode of Last Week Tonight in a duet with comedian John Oliver to mourn the loss of the Russian space geckos . </P> <P> The song was performed live on the premiere episode of Late Night with Seth Meyers </P> <P> American indie pop duo Alex & Sierra performed the song twice on third season of The X Factor (U.S.), where they were contestants and eventually won the show . During the sixth week, the duo performed the song for the first time, with Sierra on the piano and Alex on guitar . The performance was praised by the judges, with Kelly Rowland, one of them, feeling like she was watching an awards show performance . Catriona Wightman of Digital Spy called it "pretty simple, but showed how genuinely talented they are ." The cover version of the song surpassed A Great Big World and Aguilera's version on iTunes, climbing to number 1 the morning after they sang it onstage . Series creator and head judge Simon Cowell, who mentored the group, claimed that the duo success is proof that the show is still capable of turning small - town kids into bankable stars . The duo performed the song once again on the finale of the show, eventually winning the competition . </P>

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