At the entrance of Loge we hear another important motive, that of the fire-god:
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LOGE.
From this is developed the magic fire music of "Die Walküre," and the theme is heard frequently throughout the trilogy. Sometimes it ascends, and again it descends, and at times it becomes purely melodic in the diatonic scale and the major mode, but it never loses its flickering, wavering character. When Wotan and Loge descend into Nibelheim, we hear the important theme of the Nibelungs, the smiths:
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NIBELUNG SMITHS.
This is heard very often in the tragedy, and always signifies the Nibelung race. Alberich's appearance, driving before him the Nibelungs, who have become his slaves through the power of the ring, introduces the theme of Alberich's mastery: