From Wagner’s opera, ‘Götterdämmerung’, the final part in his ‘Ring’ cycle. Act 3, Scene 1. Also occurs in the first scene of “Das Rheingold,” which is the first part of that cycle.
It’s the siren song of the Rhinemaidens, water spirits from whom the eponymous gold of the first opera was stolen.
Eliot suggests that the Thames has some guardian nymphs of its own…
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