A free textbook to learn music theory. It aligns with the Practica Musica music theory software. The software, however, isn't necessary to learn from the book. The book includes embedded media.

This open source book explores a holistic, artistic, and integrated approach to understanding the developmental connections between music and children. It guides professionals to work through music, harnessing the processes that underlie music learning, and outlining developmentally appropriate methods to understand the role of music in children’s lives through play, games, creativity, and movement. Additionally, the book explores ways of applying music-making to benefit the whole child, i.e., socially, emotionally, physically, cognitively, and linguistically.