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 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