Music teachers in secondary education tend to undervalue the professional competence of creating music, in response to educational models that prioritise the development of musical interpretation skills. The aim of this research is to identify the factors that contribute to this belief among teachers in Spain, by analysing the results of the Professional Competences of the Music Teacher questionnaire (n = 112). Significant differences were found between age categories, as well as significant linear correlations between teachers’ perceptions of their preparation during initial training, their practical skills and habits, and the professional importance they attached to their competence in musical creation.