This thesis focuses on the importance of the teacher's role in pupils' singing abilities development. For most children, singing is the favourite music activity. Besides playing, listening to music and elements of musical creativity, singing is one of the areas on which the program of teaching music in the first three grades of primary school is based. Because music influences children's development, it is very important what kind of education and music teaching is provided to them at the beginning of their schooling, when music lessons are carried out by class teachers. Open model of teaching music gives freedom to teachers in the selection and representation of songs. This model is based on trust in teachers as musically competent individuals. Teachers should be able to choose appropriate songs, strive for the quality of singing and choose activities which will foster the development of children's voice. By investigating teachers' attitudes and opinions toward singing in music teaching and toward activities developing children's voice, this thesis attempts to determine if teachers are aware of their role and responsibility in pupils' singing abilities development. The research was conducted in March and April 2018. The research instrument is the questionnaire and the participants were 32 teachers in four elementary schools in the city of Osijek (August Šenoa Elementary School, Mladost Elementary School, Fran Krsto Frankopan Elementary school and Jagoda Truhelka Elementary School). The results show that teachers consider singing as the most important area of teaching music and pupils' favourite music activity. Teachers think that pupils' musical (singing) abilities development is the main reason for singing in school. In music lessons teachers carry out activities that foster the development of pupils' voice, which is in line with their role in pupils' singing abilities development.