Der Ritt der Walküren

Then the snoring rose in a crescendo. It had now become like something out of Wagner, and it seemed to Cedric that the moment had arrived when action could safely be taken.

[...] The man heaved a sigh, and lowered himself into the chair again. And presently the room was echoing once more with the Ride of the Valkyries.

Mr Mulliner Speaking. 3 The Story of Cedric