_:_:::_:_ Music Theory Books

These are some books, that "Tad" recommended as introductory works in MusicTheory:

Practica Musica from Ars Nova software. A software and book combination that starts from the begining.

Tonal Harmony by Stefan Kostka and Dorothy Payne. Assumes you know a bit about notation. A very thorough introduction to common practice harmony, both diatonic and chromatic. An undergraduate college text.

you could also go in another direction:

Introduction to Post-Tonal Theory by Joseph Straus. You don't necessarily need to know much about common practice to deal with 20th century music concepts, so you could start here. Another undergrad text.

_Practica Musica_ will also help you with your atonal listening skills...