Katy Perry's 'Roar' knocks 'Blurred Lines' out of No. 1 spot

Katy Perry's 'Roar' knocks 'Blurred Lines' out of No. 1 spot

Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100

Katy Perry's 'Roar' Arrives Early

Chart Check: Lorde Wears The Crown / Britney Rebounds - That

IN THE MIX WITH HK™: 2013

Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100 – Billboard, roar song

Vampire Weekend bangs out carefree cover of 'Blurred Lines': Hear here

Robin Thicke scores first No. 1 album with 'Blurred Lines

Katy Perry Ties For Most Pop Songs No. 1s

Katy Perry's 'Roar' Debuts on Pop Songs Chart, Heading for Hot 100

Katy Perry performs tracks off 'Prism,' answers fan questions at

Lorde picks up four Grammy nominations