Nyiregyhazi had a cameo role playing Liszt's Mephisto Waltz in the 1944 movie "The Soul of a Monster".
His hands were supposedly filmed in the following motion pictures:

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Beast With 5 Fingers

Intriguing if not entirely successful mood-piece about aging pianist and strange doings in his household. Lorre's confrontation with disembodied hand a horror highlight.

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A Song to Remember
(as Chopin's hands)

A biography of Chopin

This lavish musical biography follows the life of the pianist and composer Frederic Chopin from his humble beginnings as a child prodigy in Poland. Later, in protest against Czarist rule in their native country, the 22-year-old Chopin and his music teacher flee to Paris. But Chopin falls in love with the writer George Sand and, instead of performing in Europe, he goes off with her to Majorca. However, Chopin's political convictions resurface and even though he's gravely ill, he undertakes a concert tour to raise funds for the liberation of Poland.

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Song of Love
(as Schuman's hands & perhaps the face/body in profile of Liszt)

Classy production but slow-moving story of Clara Schuman (Hepburn), her composer husband (Henreid) and good friend Brahms (Walker).