Chord Construction Lesson
Aug vs Dim Tones
Augmented chords, usually notated as "aug" or "+", are constructed with the 1st, 3rd, and #5th notes of the major scale.
Diminished chords, usually noted as "dim" or "o", are constructed with the 1st, b3rd, and b5th notes of the major scale.
This Daug chord shape is constructed of 1 (R for root), 3, and #5.