How do we identify chords when there is only two notes? I am really confused because so far, I’ve sticked with using triads and it sounds too abrasive for my taste, but I do not know how to classify chords that contain only two notes.
You can identify a chord if it has two notes as long as it is the root and 3rd.
If you break down a chord, the root tells you the name of the chord – C, D, E, etc.
The third tell you the tonality – major or minor.
The 5th is technically not necessary, although if you want an augmented triad or diminished triad, obviously you can’t do that without a 5th.
If you have just a root and 5th, the chord sounds empty and ambiguous. This doesn’t mean it’s bad. This is a great sound and effect to understand and use, especially if you want the piece to sound ambiguous. Debussy and Ravel use this sound very often.