Katy Perry’s upbeat pump up tune Roar is taking the world, or parts of it anyway. In the week since its release, the single has sold 557.000 digital copies, according to MTV. The sales meant the song is now at the top of the Billboard Digital Songs Chart. Roar turns out to be the fastest seller of Katy Perry’s career, surpassing even her 2010 smash hit Firework, which shifted 509,000 copies in its first week.

Katy Perry, The Smurfs Premiere
Katy Perry returns roaring.

Meanwhile, the rest of the Digital Songs Chart looks pretty familiar – Lady GaGa’s Applause enters at number 3, while Robin Thicke’s Blurred Lines at 2, Jay Z’s Holy Grail at 4 and Miley Cyrus still partying it up with with We Can’t Stop at 6, the chart this week also features a fresh addition. 16-year-old New Zealand native Lorde is having a completely different kind of party at Number 10. This is Lorde’s first foray into the Billboard chart, but with clever original lyrics, an interesting voice and a chilled out, relatable image like hers, it it’s likely to be the first of many. With 107,000 digital downloads thus far, the song enters the chart with a bang this week.

Lady Gaga, LA
Lady Gaga's return comes with a brand new image and mission statement.

In case you’re wondering about the unmentioned number 5, it belongs to Luke Bryant this week, with his “That’s My Kind of Life” selling 164,000 copies. Avicii’s “Wake Me Up” storming number 7 and Imagine Dragons’ internet powered reign beginning to slip. The band’s Radioactive has dropped from 4 to 9 in the chart this week, with only 117,000 downloads.

Lorde's upcoming album Pure Heroine is one of the most anticipated of 2013.