All musicians practice ear training constantly, whether or not they are cognizant of it. If, when listening to a piece of music, a musician is envisioning how to play it or is trying to play along, that musician is using his or her 'ear' - the understanding and recognition of musical elements - for guidance.
Steve VaiI knew that I was going to have a life as a musician, because I always felt the pull. I don't remember ever having to make a choice.
Steve VaiI wanted to be a composer before anything else. And my sister was listening to Led Zeppelin in the other room! When I heard that, it was a game-changer.
Steve Vai