Tops at iTunes

The top singles at iTunes for the week ending Sept. 2.

1. "Roar," Katy Perry

2. "Berzerk," Eminem, above

3. "Blurred Lines,"

Robin Thicke, featuring T.I. and Pharrell

4. "Applause," Lady Gaga

5. "Wrecking Ball,"

Miley Cyrus