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

To no one's surprise, Katy Perry's new single "Roar" is off to a roaring good start. The song leaked prematurely to the Internet on Saturday, Aug. 10 -- two days before its planned premiere today (12).

Full song) Katy Perry - Roar (2013)

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Song - Firework - Choral and Vocal sheet music arrangements