Just outside the Hot 100’s top tier, the “Glee” cast rockets in at No. 12 with its cover of Fun.’s “We Are Young,” which enters Digital Songs at No. 3 with 137,000 downloads sold. The Fox TV troupe’s exposure of the song - marking one of the few times that the show has remade a song not yet a current mass-appeal hit; it previously covered Bruno Mars’ album cut “Marry You” - concurrently spurs Fun.’s original, featuring Janelle Monae, to debut on the Hot 100 at No. 53, logging digital sales of 49,000 (up from 3,000) and a 34-28 advance on the Alternative Songs radio airplay chart. 

billboard.com