Is Katy Perry still the pop force she once was? Her Austin show revealed 5 moments that prove her appeal—even amidst recent ...

The song shows a 17% increase to 263,000 downloads sold (although it retreats 2-3 on Digital Songs); jumps 8-5 on Streaming Songs (5 million, up 25%); and reaches the Radio Songs top 10 (13-5 ...