 The episode features mash @-@ up covers of " It 's My Life " by Bon Jovi and " Confessions Part II " by Usher , and " Halo " by Beyoncé Knowles and " Walking on Sunshine " by Katrina and the Waves . Both tracks were released as singles , available for digital download . " Vitamin D " was watched by 7 @.@ 30 million US viewers , and received generally positive reviews from critics . Performances by Morrison , Mays and Jane Lynch as <unk> coach Sue Sylvester attracted praise , as did the staging of the musical mash @-@ ups . However , <unk> <unk> of MTV and Mandi Bierly of Entertainment Weekly both noted critically that dramatic storylines in the episode dominated over the musical performances . 
