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Nevertheless, the piece is beautifully scored for 20 instruments, particularly the gauzy opening wash of bitonal strings with delicate harp, violin and flute solos curling over them.

Yet even here, Puccini’s arias had the greatest effect, as Ms. López’s voice flitted across the ecstatic high notes of the quartet from “La Rondine” and drooped, almost colorless, into the bitonal wooziness of “Amici fiori” from “Suor Angelica.”

Just before the end, darksome bitonal chords began crashing on the harp and piano, like the bell of a phantom cathedral.

The mix of bitonal harmonies and exquisite textures was superbly negotiated and displayed.

Maazel and the Viennese give this mettle tester a commanding reading, capturing the grandeur of its arresting introduction, the suavity of its incongruous waltz and the enigma of its bitonal ending.