Performers who have studied classical music extensively are said to be "classically trained". This training may be from private lessons from instrument or voice teachers or from completion of a formal program offered by a Conservatory, college or university, such as a B.mus. or M.mus. degree (which includes <answer>individual lessons from professors</answer>). In classical music, "...extensive formal music education and training, often to postgraduate [Master's degree] level" is required.
What does a B.mus. or M.mus. degree include?
individual lessons from professors