In music education carried out special purposes such as developing the individual's musical perception-knowledge, aesthetic thought, creativity, ability, individual, social relations, mental skills and etc., it has been considered important for the classroom teacher to have sufficient knowledge of the music field and to use this field knowledge in the education process. For this reason, the high level of self-efficacy beliefs towards music education of classroom teachers who are working in primary school level, one of the important steps of basic education, will contribute to the effective and productive education and to educate equipped individuals. Music education activities contribute not only to the academic success of children, but also to the development of identity, friendship and social communication. Therefore, it has been considered important for the child to benefit from music education that can maximize his/her interests, needs and capacities in the primary school period, and it has been thought that the classroom teacher's being equipped in the field of music education and having high self-efficacy level will support and shape the child's musical development process. In respect to this, the study aimed to present the adaptation and validity-reliability studies of the "Problem Determination Scale for Physical Education and Sports Course" developed by Bozdemir (2012) to the determination the self-efficacy of the classroom teachers towards the music lesson. The research was carried out with 252 classroom teachers working in primary schools with the permission of The Provincial Director of National Education, numbered 5445474, dated 14 March 2019, in Usak, Turkey. As a result of the validity and reliability studies with 5-point Likert-type scale, it was determined that the scale has been adapted to the selfefficacy scale for music lessons and consisted of 20 items distributed across 5 factors. Kaiser-Meyer-Olkin sample suitability test for determining whether the data obtained from the application of the scale is suitable for factor analysis and Factor Analysis for determining the factor structure of the scale were performed. Cronbach Alpha coefficient was also determined to test its validity and was calculated as 0.743. As a result of the principal components analysis which was applied to be able to analyze the dataset with factor analysis, 5 factors with an eigenvalue of 1 and above were formed. According to the results obtained, it can be said that the scale adapted to measure the self-efficacy of classroom teachers for music education is an appropriate measurement tool.