Heifetz in his prime, playing Saint-Saens' Introduction and Rondo Capriccioso. From the 1939 movie, "They Shall Have Music". Possibly the best bit of fiddle playing from him I have ever seen. The slow sections reflect his wondrous capability for expression.
I know this has been uploaded, but this is of much better quality, and it's in English ;)
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I still don't understand why they would speed it up though.