Start page for comprehensive guide to Schenker's theory of harmony, counterpoint and tonal music.
Tonal Music - Abstract. This book deals with the aesthetics of tonal music and analyses sound forms, such as consonance, dissonance ...
and there's of course this site: it's an in depth study of how music works, how root progressions relate to themselvs.
it's ****ing interesting btw so i usuggest you all take a look into it: http://www.harmony.org.uk
from the glossery there it says about tonal music:
"Term used to denote the western system of music which is based on major and minor keys and a series of chords and notes related to a central tonic note which determines the key of a piece."
is there really music that isn't built on that?!