Hearing Harmony: What is Harmony (A. Brandt)- A pre-harmony training course.
Music 101 - From Lumen. Covers a variety of genres, composers, eras.
Music and the Child (N. Sarrazin) - Explores the developmental connections between children and learning.
Music Fundamentals: Pitch and Major Scales and Keys (T. Ewell) - This book deals with the rudiments of music
Music Fundamentals 2: Rhythm and Meter (T. Ewell) - This book deals with the basics of rhythm and meter.
Understanding Basic Music Theory (C. Schmidt-Jones) - Basic skills and information.
Understanding Music Past and Present (A. Clark) - A music history textbook.