Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016.
Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016. Paul Sancya AP
Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016. Paul Sancya AP