In January 2011 , rumors began to circulate that '' Glee '' was planning a Justin Bieber tribute episode , similar to " The Power of Madonna " for Madonna , and " Britney/Brittany " for Britney Spears . Series creator Ryan Murphy refuted the claims , and stated that such episodes are reserved for artists with extensive musical catalogs . He confirmed , however , that Bieber 's music would be used in an episode in season two as a " small plot point " , and Overstreet 's Sam would perform a song by the artist for Quinn 's approval . On the red carpet at the 68th Golden Globe Awards , cast member Riley confirmed to MTV News that Bieber 's songs " Baby " and " Somebody to Love " would be featured in the upcoming episode , and the singer would receive a tribute similar to Lady Gaga in " Theatricality " — a tribute , but without a full episode devoted to his catalog . Via his official Facebook page , Bieber stated that he was " truly honoured " to have his music covered on '' Glee '' . Prior to broadcast , Overstreet and Bieber interacted via the social networking website Twitter , where Bieber told him " we just got ta work on those moves " , and to " kill it ! " In addition to " Baby " and " Somebody to Love " , the episode featured cover versions of " I Know What Boys Like " by The Waitresses performed by Fink , " Take Me or Leave Me " from '' Rent '' performed by Michele and Riley , " Sing " by My Chemical Romance , and an acoustic performance of the gospel children 's song " This Little Light of Mine " . The pediatric oncology scenes were filmed at the Children 's Hospital Los Angeles ' Center for Cancer and Blood Diseases , where eleven real patients performed alongside Morrison and Lynch . Bailey , the pediatric ward nurse , was played by guest-star Charlene Amoia , who had worked for the series ' sound department during the first season . In June 2011 , she deemed her " Comeback " appearance her favorite guest role in any series , due to working alongside the children , whom she was " so touched by " . Amoia expanded : " They were the most vibrant , energetic kids . It was a really awesome storyline to be a part of . I was really moved by everything . " Though she was not initially aware that the role would involve singing , Amoia was part of the " This Little Light of Mine " group number . The episode 's recurring guest cast members were Overstreet as Sam , Iqbal Theba as Principal Figgins , Shum , Jr. as Mike and Fink as Lauren
68th Golden Globe Awards
68th Golden Globe Awards
Comeback (Glee)