Yes, Joe Satriani did Teach Steve Vai how to play when they were both teenagers, but it has been at least 30 years since then and they are both completely different guitarists now due to their own individual experiences. Frank Zappa had a huge impact on Vai, because he started transcribing for him when he was only 19, and started playing for him shortly thereafter.
Please, have a listen to both and tell me, if you had no idea who they both were, that you could tell they were teacher and student. (btw, they are more like really good friends now)
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Originally Posted by
Frankie K 
True on that point of speed, but did'nt Joe Satriani teach Steve Vai how to fly! We also have Jimmy Page, there's also Jeff Loomis and Angus Young! This thread could go on a really Looong time. But to rank who is the Best of all time that is going to be a tough one and not all of Us will be happy. I know there are a lot of great players out there that many of Us have not heard yet and that is the beauty of it all, that We can check them out for our selves. 