The aim of this final thesis is to present the life of the composer Josip Kaplan and state his compositional opus. The target group to which the cycle is presented are children and young people in school institutions. The primary focus is performance on the piano. Data from Jakša Zlatar's book will support the performance. Zlatar states musical parameters such as dynamics, color, tempo, pulse, agogics, accentuation, articulation and phrasing that abound in the „Istarski kvadri“ cycle. The author of the work was inspired by Istrian landscapes when writing this cycle, and the work is full of Istrian characteristics such as the Istrian scale, which is under the UNESCO cultural heritage. It is also called a tonal sequence or modus and consists of major and minor seconds. Its range is the interval of a major sixth. Within the scope of the Istrian scale, the tritone interval stands out, which is particularly emphasized in the cycle. The presentation is designed as a combination of theory and practice, and will be brought closer to the reader through a large number of examples and pictures. „Istarski kvadri“ is a cycle consisting of three parts in the order Allegro moderato-Lento-Allegretto grazioso. It is crucial to choose the right pulse, tempo and character for each item, because these characteristics are what makes the movement different. The second movement is written as a big counter to the first and third. Allegreto gacioso is the name of the third movement, which is characterized by grace and loveliness. That item has a three-part form, has a cheerful character and is written in the form A B A'.