The aim of this study is to analyze the psychometric properties of the Musical Self-Concept Questionnaire (CAMU), an abbreviated and culturally adapted Spanish language version of the Music Self-Perception Inventory (MUSPI) developed by Vispoel. Participants comprised 1,126 students from professional and advanced conservatories located in different autonomous regions of Spain. The internal consistency of the instrument was found to be high (Cronbach's alpha = 0.907; AVE = 0.685). The exploratory factor analysis revealed an internal structure consisting of seven factors: singing, playing, reading, composing, listening, moving and general musical self-concept. Sex differences and correlations between musical self-concept and both verbal self-concept and causal attributions confirm the criterion validity of the questionnaire. In addition to being a useful tool for measuring musical self-concept in Spanish, the CAMU also enables cross-cultural research into this construct to be conducted, in line with that carried out in English.