This study is based on the premise that emotional skills--comprised of an intrapersonal dimension and an interpersonal dimension--help to achieve personal balance, which in turn can enhance performance. Following from this premise, the improvement of music students' emotional skills might have a positive effect on their musical performance. The recognized relationship between music and emotion therefore suggests that music education is a suitable context for developing emotional skills. The article examines the relationship between intrapersonal skills and the musical performance of elementary students studying the piano in a Spanish conservatory. The research was developed as an action research process and involved the study of three 10-year-old students. A set of activities were designed specifically for students attending the third course of piano studies; these activities were intended to develop students' intrapersonal skills throughout the school year and were implemented in the subjects of piano and ensemble playing in parallel with the musical tasks. The relationship between intrapersonal skills and musical performance is investigated and discussed for each of the three cases.