This cover by the Glee cast of Katy Perry's hit single
was the top selling song in the US in its debut week with sales of 214,000. The song leaped in at #1 on the Digital Songs chart marking the ensemble's first chart-topper and biggest ever sales week up to that point. Previously, the cast's best week came when its first single, "Don't Stop Believin'," debuted at #2 with 177,000 in June 2009.
The song also debuted at #8 on the Billboard Hot 100, surpassing "Don't Stop Believin'" for the highest first-week sales of any Glee