Katy Perry
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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 (Aug. 12). In turn, with less than two full days of airplay, it debuts at No. 34 on the Nielsen BDS-based Pop Songs airplay chart this week. (The chart's tracking week ends at midnight, local time, on Sunday.)

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The song bows on Pop Songs with 1,662 plays across 123 top 40 radio stations, according to Nielsen BDS. The track was supported in part by hourly play on participating Clear Channel Media and Entertainment-owned outlets on Saturday and Sunday. It's her 15th hit on the Pop Songs chart. Nine of her previous entries reached No. 1, a sum that's tied for second-best in the chart's 20-year history.

"Roar" also debuts at No. 38 on the Adult Pop Songs chart -- her 13th entry on that tally.

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"Roar" is the first single from Perry's third studio album, "Prism," which is set for release on Oct. 22. The single made its bow at digital retailers at 12 AM on Aug. 12, and then saw its official lyric video premiere on YouTube and VEVO later the same morning.

'ROAR' ON THE BILLBOARD HOT 100

Predicting where "Roar" might end up on the Billboard Hot 100 chart this week -- and next week -- is a bit difficult.

The Hot 100 is based on airplay, sales and streaming data, and is compiled every Wednesday. Its airplay tracking week runs from Wednesday through Tuesday, while its sales and streaming tracking week runs from Monday through Sunday.

Based on its initial airplay, "Roar" will likely debut on this week's Hot 100 chart somewhere in the lower quarter of the chart. Then, next week, after its first week of sales and streaming have kicked in, it should jump into the upper reaches of the tally.

Its chart trajectory could mirror that of another recent superstar release: Taylor Swift's "We Are Never Ever Getting Back Together." The song debuted on the Aug. 25, 2012-dated Hot 100 at No. 72 from airplay only. The following week, once the song had its first week of sales under its belt, the song zoomed to No. 1.

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