These videos present music theory for playing chords, scales and chord progressions on the piano. 

This video covers the use of a 5-1-4 chord progression in a song

This video gives an overview of the number system applied to scales, chords and scale tones.  You can use the number system to identify the structure of scales then use it to make chords and use chords to make music.

Chord formation is the focus of this video lesson using the C major scale as the foundation.

This is an overview of chord progressions with examples. I use a basic progression with beginner chord voicings and demonstrate how adding chords can enhance the progression.