 The most common is the pupil's concert, which gives experience in playing in public and under a certain degree of pressure, without outright criticism or a more or less arbitrary marking system.Another is the graded system of books followed by teachers of the Suzuki method, in which the completion of each book is celebrated, without a system of marking or ranking of pupils.Some studies suggests that music lessons provide children with important developmental benefits beyond simply the knowledge or skill of playing a musical instrument.