PSY and his troupe of dancers take to Wembley Stadium's middle stage during the Summertime Ball 2013 This image appears in the gallery:PSY At The Summertime Ball 2013 - Pictures 2. PSY and his troupe of dancers take to Wembley Stadium's middle stage during the Summertime Ball 2013 Picture: PA 13 images See the full gallery: PSY At The Summertime Ball 2013 - Pictures