FRANKFURT : Eva Wagner-Pasquier, great grand-daughter of German composer Richard Wagner, is to quit as co-chief of the legendary Bayreuth Festival in September 2015, according to a newspaper report Friday. Wagner-Pasquier, 68, currently runs the annual summer music bash dedicated exclusively to Wagner’s operas, with her much younger half-sister Katharina Wagner, 36. They were originally appointed in 2008, taking over from their father Wolfgang Wagner (1919-2010), and their contracts are scheduled to expire in September 2015.