Overall Theory Concepts

• Easy Music Theory -- Online music theory site with progressive lessons
• MusicTheory.Net -- By Ricci Adams -- online lessons, utilities, and more
• Theory on the Web -- An online book, rather cumbersome to use, but may have some useful information
• Tutorials -- Online Flash tutorials on reading music, scales, chords, intervals and harmonic functions
• William Wieland's Piano Pages -- Help with scales, chords, cadences, and more
• Music Theory by Music Notes -- Gives a good overview of concepts to read through

Key Signatures

• Key Signature Flash Cards -- Interactive online flash cards of key signatures
• Key Signature Practice -- Practice for all major and minor key signatures
• MusicTheory.Net Key Trainer -- By Ricci Adams -- Includes settings for major and minor keys, and choices for treble, bass, alto, and tenor clefs

Intervals                                                                                                                          

• Interval Flash Cards -- Interactive online flash cards of intervals
• eMusic.Com Interval Practice Treble Clef -- Interactive drill of treble clef intervals, both aurally and visually
• eMusic.Com Interval Practice Bass Clef -- Interactive drill of bass clef intervals both, aurally and visually
• MusicTheory.Net Interval Trainer -- By Ricci Adams -- includes major, minor, augmented, and diminished, and settings to turn these on/off.  This is by sight on the music staff only. NOT aural, just visual.
• MusicTheory.Net Interval Ear Trainer -- By Ricci Adams -- settings for direction and play mode.  PLAYS intervals for identification AURALLY.

Triads/Chords                                                                                                                               Top

• Triad Flash Cards -- Interactive online flash cards of triads
• Music Online Quiz -- Replaced by MusicTheory.Net Chord Ear Trainer below!
• Virtual Piano Chords -- Chordal structures by keys in notes, numbers, and scale displays
• Interactive Piano Chord Chart -- 8Notes.Com's Interactive Piano Chord Chart for all the keys
• Piano Chord Chart -- From Scott Bradford, PDF file showing keyboard diagrams for major, minor, diminished, and suspended chords
• MusicTheory.Net Triad Trainer -- By Ricci Adams -- Includes major, minor, augmented, and diminished. Includes settings to turn root accidentals and inversions on and off.  Visual recognition of triads on the staff.  NOT aural, just visual.
• MusicTheory.Net Chord Ear Trainer -- By Ricci Adams -- Includes major, minor, augmented, and diminished.  Settings include inversion, play mode, choice of suspensions, etc. PLAYS chords for identification AURALLY.

Scales

• Robert T. Kelley's Scale Fingering Chart -- One teacher's version of the most "physically practical" scale fingerings, but not most commonly used ones.  Not typical fingerings!  Use with caution in piano festivals and competitions!
• Major Scale Fingerings -- All 12 major scales C through B with fingerings
• Piano Scale Chart  -- From Scott Bradford, PDF file highlights the piano keys of all scales; does not help with fingerings.
• Mastering Scales -- Free piano lesson on mastering major and minor scales.  Includes fingerings for major scales.
• Proper Fingering of Scales -- Print out notes of scales with fingerings, both major and minor.