The purpose of the study is to investigate how four professional music teachers’ reason about and use teaching materials for music teaching in practice. Four semi-structured interviews have been conducted to investigate the extent to which teaching materials in music are used and what potential for improvement there is in terms of the current range of teaching materials for music teaching. The study is based on a socio-cultural perspective, previous research on teaching aids and the use of teaching aids. The results show that digital teaching materials are used mainly in music teachers' teaching. Analog teaching materials are used less partly because the supply is perceived as deficient or because what is offered does not meet the music teachers' requirements for teaching materials. The use of self-produced teaching materials occurs in the music teachers' teaching. The potential for improvement for teaching materials is based on two aspects. One aspect concerns how the connection between theory and practice is significant. Teaching materials with a clear connection to the curriculum, syllabus and knowledge requirements can ensure that the teacher's assignment is fulfilled. The second aspect concerns how teaching materials are modern in relation to the present. This is to be experienced as more attractive to the students, which can lead to increased interest in the subject of music.