Most probabaly you are talking about: Caprice 5 in A.
Coz there are other 5th caprices too like: Caprice 05 - Agitato .......
B.t.w. this one is popularly known asd Eugene's (bag of) trick (or some crap like that. Done by Steve Vai.
Countless other guitarsists have also done it. (Even I tried but my slow left hand fingers didnt permit me)
But have you listened to the violin version? It is amazing.
b.t.w. if you need tabs search for Eugene's thingie under Steve Vai.
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