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 VaiIt's always funny to me when people use the phrase 'Best guitar player in the world'. There are too many variables such as technique, uniqueness, emotional investment in the notes, etc. But If I had to pick one, it would be Tommy Emmanuel. Watching him perform can be a study in artistic and virtuosic human achievement.
Steve VaiThe level of achievement that we have at anything, is a reflection, of how well, we were able to focus on it. Because the only thing that's holding you back, is the way you're thinking.
Steve Vai