Z, the first thing is that you must be warned that on penalty of death ist verboten to refer to classical orchestral excerpts(especially by Wagner!)as "songs".

My favorite CD that has the two excerps you mentioned(assuming it's the Prelude to Act I of Lohengrin;the Preludes to Acts II and III are somewhat less famous)is on Deutsche Grammophon DG 447 764 with Levine conducting the Met Orchestra. Of course, I could also give you a laundry list more.

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Enjoy the music, not the equipment.