 The musical performances were given a middling to positive response overall , and the final song , " Somebody That I Used to Know " , received the most enthusiastic reception . Bell called it the " highlight of the episode " , and it was Hankinson 's favorite performance : " Bomer and Criss did a fantastic job bringing it to life " . Futterman said that " it was initially disconcerting to envision " two brothers singing about a " former love " , but she noted that it " was less weird in context " . Flandez felt that with the song 's conversion to a " Cain @-@ and @-@ Abel therapy session " , despite being " gorgeously sung " , it was nevertheless " the most disappointing duet ever " , but Slezak gave the performance an " A − " , and wrote , " I bought the sibling angst in the room , and Matt Bomer really is a charismatic fella , no ? " Strecker gave the song an " A " and stated , " Shout @-@ out to the Glee writers this episode for not only picking fun songs , but also tracks that were all really great lyrically in terms of moving the plot forward . " 
