Fun.'s "We Are Young," featuring Janelle Monae, spends a fifth week atop the Billboard Hot 100, while Justin Bieber's "Boyfriend" roars in at No. 2 with 521,000 downloads sold, according to Nielsen SoundScan. And it was a busy week at the top of the Billboard 200, where Madonna earned her eighth No. 1 album with "MDNA" bowing with 359,000 sold, according to Nielsen SoundScan.
