Music Theory articles usually tackle one or two key theory issues. Almost all instruction here is geared towards the performer. In other words, many articles try to explain how music theory knowledge translates into interpretation and performance.
Music Theory
Articles in Music Theory
Emotion and Music Theory in the Interpretation of Music
Learn to Count (and Play!) Cross-Rhythms
Three Important Things to See
How to Use Modes for Improvising
Form > Harmony
Non-Chord Tones
Modes of the Major Scale
Cadential 6/4 Chords
The Neapolitan
Secondary Dominants
Harmonic Rhythm
Mixture
Chords in the Minor Scale
Forms of the Minor Scale
Form in Music- Rondo
Phrase Structures
Chord Inversion
ii, IV and vi
Types of Cadences
Form in Music