In today's world, shyness is a common phenomenon among children and adults. The paper deals with the influence of shyness on students when performing musical activities, but it is necessary to understand why shyness occurs. At the beginning of the paper, personality types are listed and how introverts are more susceptible to shyness than extroverts. External factors and influences are of great importance for the appearance of shyness. Shyness in children is influenced by the family, school, and peer environment. It should certainly be considered that not every shy child is the same, and that there are types, levels, and gender differences in shyness. Shyness itself also affects other feelings in children, such as self-esteem which is lower if the child has a high degree of shyness. In music lessons the performed activities are singing, playing, dancing/movement and musical games. To a lesser extent, the paper also deals with the issue of organization of the mentioned activities. The most common activity is singing, and in schools playing is less represented because of various reasons (inadequate equipment, lack of time). Teachers as leaders of the educational process have an important role in creating the classroom atmosphere. This means that teachers should know how to approach each student, including the shy ones, and know how to help them to be more relaxed and to be themselves. Shy children have less success in performing musical activities because of their insecurity and withdrawing into themselves. Activities that can help to suppress shyness are various musical games, but it is important that they are well thought out so that children are unburdened and enjoy them.