Admission procedures to elementary school in Music Conservatoires in Portugal consist in the assessment of aural aptitude. This investigation aims at assessing the power of aural aptitude at predicting future musical achievement as well as the assessment of two other variables for the same purpose: motivation and intentions of parental support. For that matter, our sample includes the cohort of the admitted candidates and their parents to the 2019 to 2020 academic year. We used a longitudinal approach that followed the musical achievement of the sample during the 2019 to 2020 and 2020 to 2021 academic years. Questionnaires were administered to both children and parents to collect information on motivation to learn a musical instrument and anticipation of parental support provision. Our results point that, after 2 years of music education, neither of the tested variables were able to predict the students' musical achievement. These results suggest that the model of admission procedures to Music Conservatoires based on aural aptitude must be rethought and that this line of investigation could be revisited later when our sample enters middle school to assess again the predicting power of motivation and parental support.