Group lessons have a different dynamic than private lessons. They are more active and social. Group lessons often include more audio/visual elements like computer and ear training stations or lesson display screens. This can be a great advantage to many learners. Many adults enjoy the social interaction of group classes and young learners often find this environment less threatening than private lessons.
Group lessons are also more cost effective per contact time than private lessons. An hour session (55 min.) is usually about 10% less than a half hour of private lessons.