(Photo: Felix Grünscloß) Among the offerings at this year’s Karlsruhe Händelfestspiele was a performance of “Phèdre,” an opera by the fairly obscure French composer Jean-Baptiste Lemoyne. What the connection is to Händel, however, is somewhat of a mystery. There was no explanation provided in the program. The two composers never met; in fact, Lemoyne would have only been eight years {…}