Elementary works

Fundamentals of Music: Rudiments, Musicianship, and Composition

Earl Henry, Susan Piagentini, Jennifer Snodgrass

Practical beginning theory: a fundamentals worktext

Bruce Benward, Barbara Garvey Jackson, Bruce R. Jackson.

Concise Introduction to Tonal Harmony

L. Poundie Burstein, Joseph N. Straus

Fundamentals of music: rudiments, musicianship, and composition

Earl Henry.

Fundamentals of music theory for the windband student: a new music theory workbook for band

by Eric Harris

The music kit

Tom Manoff

Practical Theory: A Self-Instruction Music Theory Course (Practical Theory)

Sandy Feldstein

An ABC of music: a short practical guide to the basic essentials of rudiments, harmony, and form

by Imogen Holst ; with a foreword by Benjamin Britten

Introduction to Digital Music with Python Programming: Learning Music with Code

Michael Horn, Melanie West, Cameron Roberts

Music theory for dummies

by Michael Pilhofer and Holly Day.