The topic of this thesis is the interdisciplinary connection of music and non-musical subjects of class teaching. The open programme of teaching music gives teachers greater freedom in the creation of the teaching process. As responsible and competent experts, they have the freedom to organise and do what they think is useful – music-wise – for students of a particular class. Furthermore, class teachers do not have to strictly follow the timetable. They therefore have the possibility of creating an interdisciplinary correlation between music and other subjects not related to music. For the purpose of this thesis a research has been conducted which took place during three weeks of the 2014-2015 school year in several primary schools in Osijek-Baranja County. The research included 31 respondents (class teachers). The questionnaire sought to determine the views of class teachers. Also for the purposes of the research, the teaching of non-musical subjects (Croatian, Maths, Science and Social Studies, Art, Physical education) were observed in Primary school Šećerana (i.e. District school Branjin vrh) in the first four grades with the aim of observing the interdisciplinary linking of music to the aforementioned subjects. The results of the research show that teachers make interdisciplinary connections between the teaching of music and non-musical subjects, most often Physical Education. Musical activities in non-musical subjects are mostly used as a soundtrack, as a means of motivation and relaxation of students or to create a working atmosphere. Listening was the most frequently used activity in non-musical subjects, whereas playing instruments was the least frequently used. It has also been established that teachers have a positive view of interdisciplinary connecting music with non-musical subjects.