Wha'was that? Wha'was that?

I don't know if you saw the concert with Vadim Repin I suggested you to check out on Arte Live Web. In any case it's still viewable on the same link. Note in particular the tune Repin plays as encore: it's one of those tunes I had running in my head for years but I never knew what it was.
You know the situation when you ask the folks around you "Hey, what was that?!" they pretend they didn't hear your question, and later on it's too late... ? And then, when you finally uncode it, it feels goood ;)
 
Most of you very probably know it, but in case you don't, it's Paganini's "Il Carnevale Di Venezia"

Here is a YT video