For 10 points—name this composer of The Flying Dutchman, Lohengrin, and The Ring of the Nibelung.
He wrote an opera in which Ada is turned into stone before being saved when Arindal plays the lyre and sings the aria "O ihr, des Busens Hochgefühle", and wrote another opera in which Isabella enters a convent before visiting her brother Claudio in prison and discussing a proposal by Friedrich.  In addition to The Fairies and The Ban on Love, this composer wrote an opera in which Erik loves Senta, the daughter of Daland and wife of the title character, one in which Elsa sings "Alone in dark days" before the title character arrives in a boat pulled by a swan, and a cycle of operas that ends after Brünnhilde orders the building of a funeral pyre for Siegfried and the Rhine overflows its banks.  For 10 points—name this composer of The Flying Dutchman, Lohengrin, and The Ring of the Nibelung.
He wrote an opera in which Ada is turned into stone before being saved when Arindal plays the lyre and sings the aria "O ihr, des Busens Hochgefühle", and wrote another opera in which Isabella enters a convent before visiting her brother Claudio in prison and discussing a proposal by Friedrich.  
Richard {Wagner}