Did Katy Perry Steal A Song? A Forensic Musicologist Weighs In
In this Sept. 16, 2014 file photo, Katy Perry performs on stage at "The Prismatic World Tour" at the Honda Center in Anaheim, Calif.
( John Shearer/Invision/AP, File )
( John Shearer/Invision/AP, File )
Produced by Isabel Angell
Hosted by Tanzina Vega
