This research analyses Francesca Caccini’s Il primo libro delle musiche as representative, not only of her musical style, but also of her characteristics as performer and voice teacher. The first chapters embrace her early musical life and the influences of her father in her musical style and career, followed by a brief explanation of Giulio Caccini’s compositional characteristics. The succeeding section clarifies the ornaments adopted by Francesca and her father in their songs, and the way they should be sang according to Giulio’s collection Le nuove musique. In order to analyze Il primo libro as an important pedagogic source to professors and students around 1600’s, the next chapters discuss the early concept of vocal technic and teaching during the sixteenth and seventeenth centuries based on treatises by Píer Tosi and Giambattista Mancini, and how these ideas could be associated with Francesca as a voice professor and “maestrina” inside the Medici’s court.