有關音樂既樂理

http://www.baronschoolofmusic.com/


http://hk.geocities.com/tinymusicroom/

http://www.ism.edu.mo/outline/Course/Pri/C4DMUS/

以上d網都有樂理學

這個是比較普及的知識
http://www.musictheory.net/
Content:
The Staff, Clefs, and Ledger Lines
Note Duration
Bars and Time Signature
Rest Duration
Dots and Ties
Simple and Compound Meter
Odd Meter
Whole Tones, Semitones and Accidentals
The Major Scale
The Minor Scales
Scale Degrees
Key Signatures
Key Signature Calculation
Generic Intervals
Specific Intervals
Writing Intervals
Interval Inversion
Introduction to Chords
Triad Inversion
Diatonic Triads
Roman Numeral Analysis
Voicing Chords
Analysis #1
Seventh Chords
Diatonic Seventh Chords
Seventh Chord Inversion
Composing with Minor Scales
Nonharmonic Notes
Phrases and Cadences
Circle Progressions
Common Chord Progressions
Triads in First Inversion
Triads in Second Inversion
Analysis #2
Building Neapolitan Chords
Using Neapolitan Chords
Analysis #3

以下的有較深入探討的樂理網, 除樂理外還有作曲, 配器和小量音樂史
http://www.dolmetsch.com/theoryintro.htm