The first guitarist that hear in this tune is Wes Montgomery  Wes was the master of playing octaves, e.g he’d play an E and then at the same time he’d play an E further up the scale, this was one of his distinguishable characteristics of his playing. 

The next player I hear in here is Hendrix, I’m thinking Little Wing and also the way Jimi would play a slow blues and use all those hammer-ons and pull=offs whilst holding down a chord.

The next player I here is Jeff Beck, the tone is so Beckonian to me.  Yes Steve Vai takes it and runs with it but I definitely hear Beck in there.  From there he starts to use more contemporay style of left hand technique.  And from there he reeps back into Hendrix. 

Now this is my opinion, you may hear other elements.